diff --git a/src/main/java/net/server/channel/handlers/CashShopSurpriseHandler.java b/src/main/java/net/server/channel/handlers/CashShopSurpriseHandler.java
index 7b338dc082..9fff47092f 100644
--- a/src/main/java/net/server/channel/handlers/CashShopSurpriseHandler.java
+++ b/src/main/java/net/server/channel/handlers/CashShopSurpriseHandler.java
@@ -42,7 +42,8 @@ public class CashShopSurpriseHandler extends AbstractPacketHandler {
             return;
         }
 
-        Optional<CashShopSurpriseResult> result = cs.openCashShopSurprise();
+        long cashId = p.readLong();
+        Optional<CashShopSurpriseResult> result = cs.openCashShopSurprise(cashId);
         if (result.isEmpty()) {
             c.sendPacket(PacketCreator.onCashItemGachaponOpenFailed());
             return;
diff --git a/src/main/java/server/CashShop.java b/src/main/java/server/CashShop.java
index ae9a45599e..498fe12fdc 100644
--- a/src/main/java/server/CashShop.java
+++ b/src/main/java/server/CashShop.java
@@ -29,6 +29,7 @@ import client.inventory.Pet;
 import config.YamlConfig;
 import constants.id.ItemId;
 import constants.inventory.ItemConstants;
+import net.jcip.annotations.GuardedBy;
 import net.server.Server;
 import provider.Data;
 import provider.DataProvider;
@@ -408,17 +409,6 @@ public class CashShop {
         }
     }
 
-    public int getItemsSize() {
-        int size = 0;
-        lock.lock();
-        try {
-            size = inventory.size();
-        } finally {
-            lock.unlock();
-        }
-        return size;
-    }
-
     public List<Integer> getWishList() {
         return wishList;
     }
@@ -537,46 +527,58 @@ public class CashShop {
         }
     }
 
-    private Item getCashShopItemByItemid(int itemid) {
+    public Optional<CashShopSurpriseResult> openCashShopSurprise(long cashId) {
         lock.lock();
         try {
-            for (Item it : inventory) {
-                if (it.getItemId() == itemid) {
-                    return it;
-                }
+            Optional<Item> maybeCashShopSurprise = getItemByCashId(cashId);
+            if (maybeCashShopSurprise.isEmpty() ||
+                    maybeCashShopSurprise.get().getItemId() != ItemId.CASH_SHOP_SURPRISE) {
+                return Optional.empty();
             }
+
+            Item cashShopSurprise = maybeCashShopSurprise.get();
+            if (cashShopSurprise.getQuantity() <= 0) {
+                return Optional.empty();
+            }
+
+            if (getItemsSize() >= 100) {
+                return Optional.empty();
+            }
+
+            CashItem cashItemReward = CashItemFactory.getRandomCashItem();
+            if (cashItemReward == null) {
+                return Optional.empty();
+            }
+
+            short newQuantity = (short) (cashShopSurprise.getQuantity() - 1);
+            cashShopSurprise.setQuantity(newQuantity);
+            if (newQuantity <= 0) {
+                removeFromInventory(cashShopSurprise);
+            }
+
+            Item itemReward = cashItemReward.toItem();
+            addToInventory(itemReward);
+
+            return Optional.of(new CashShopSurpriseResult(cashShopSurprise, itemReward));
         } finally {
             lock.unlock();
         }
-
-        return null;
     }
 
-    public synchronized Optional<CashShopSurpriseResult> openCashShopSurprise() {
-        Item cashShopSurprise = getCashShopItemByItemid(ItemId.CASH_SHOP_SURPRISE);
-        if (cashShopSurprise == null || cashShopSurprise.getQuantity() <= 0) {
-            return Optional.empty();
+    @GuardedBy("lock")
+    private Optional<Item> getItemByCashId(long cashId) {
+        return inventory.stream()
+                .filter(item -> item.getCashId() == cashId)
+                .findAny();
+    }
+
+    public int getItemsSize() {
+        lock.lock();
+        try {
+            return inventory.size();
+        } finally {
+            lock.unlock();
         }
-
-        if (getItemsSize() >= 100) {
-            return Optional.empty();
-        }
-
-        CashItem cashItemReward = CashItemFactory.getRandomCashItem();
-        if (cashItemReward == null) {
-            return Optional.empty();
-        }
-
-        short newQuantity = (short) (cashShopSurprise.getQuantity() - 1);
-        cashShopSurprise.setQuantity(newQuantity);
-        if (newQuantity <= 0) {
-            removeFromInventory(cashShopSurprise);
-        }
-
-        Item itemReward = cashItemReward.toItem();
-        addToInventory(itemReward);
-
-        return Optional.of(new CashShopSurpriseResult(cashShopSurprise, itemReward));
     }
 
     public static Item generateCouponItem(int itemId, short quantity) {
diff --git a/src/test/java/net/server/channel/handlers/CashShopSurpriseHandlerTest.java b/src/test/java/net/server/channel/handlers/CashShopSurpriseHandlerTest.java
index ff97b11fe3..71d0246ab1 100644
--- a/src/test/java/net/server/channel/handlers/CashShopSurpriseHandlerTest.java
+++ b/src/test/java/net/server/channel/handlers/CashShopSurpriseHandlerTest.java
@@ -2,6 +2,7 @@ package net.server.channel.handlers;
 
 import client.inventory.Item;
 import constants.id.ItemId;
+import net.packet.InPacket;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -15,6 +16,7 @@ import tools.PacketCreator;
 
 import java.util.Optional;
 
+import static org.mockito.ArgumentMatchers.anyLong;
 import static org.mockito.Mockito.never;
 import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
@@ -31,21 +33,25 @@ class CashShopSurpriseHandlerTest extends HandlerTest {
         when(chr.getCashShop()).thenReturn(cashShop);
     }
 
+    private InPacket useCashShopSurprisePacket(long cashId) {
+        return Packets.buildInPacket(out -> out.writeLong(cashId));
+    }
+
     @Test
     void shouldDoNothingWhenCsIsNotOpened() {
         when(cashShop.isOpened()).thenReturn(false);
 
-        handler.handlePacket(Packets.emptyInPacket(), client);
+        handler.handlePacket(useCashShopSurprisePacket(123), client);
 
-        verify(cashShop, never()).openCashShopSurprise();
+        verify(cashShop, never()).openCashShopSurprise(anyLong());
     }
 
     @Test
     void shouldSendFailurePacketWhenFailToOpen() {
         when(cashShop.isOpened()).thenReturn(true);
-        when(cashShop.openCashShopSurprise()).thenReturn(Optional.empty());
+        when(cashShop.openCashShopSurprise(anyLong())).thenReturn(Optional.empty());
 
-        handler.handlePacket(Packets.emptyInPacket(), client);
+        handler.handlePacket(useCashShopSurprisePacket(456), client);
 
         verify(client).sendPacket(PacketCreator.onCashItemGachaponOpenFailed());
     }
@@ -55,10 +61,10 @@ class CashShopSurpriseHandlerTest extends HandlerTest {
         when(cashShop.isOpened()).thenReturn(true);
         Item cashShopSurprise = Items.itemWithQuantity(ItemId.CASH_SHOP_SURPRISE, 3);
         Item reward = Items.itemWithQuantity(5000012, 1);
-        when(cashShop.openCashShopSurprise()).thenReturn(Optional.of(new CashShop.CashShopSurpriseResult(
+        when(cashShop.openCashShopSurprise(789)).thenReturn(Optional.of(new CashShop.CashShopSurpriseResult(
                 cashShopSurprise, reward)));
 
-        handler.handlePacket(Packets.emptyInPacket(), client);
+        handler.handlePacket(useCashShopSurprisePacket(789), client);
 
         verify(client).sendPacket(PacketCreator.onCashGachaponOpenSuccess(ACCOUNT_ID, cashShopSurprise.getCashId(), 3,
                 reward, 5000012, 1, true));
diff --git a/src/test/java/testutil/Packets.java b/src/test/java/testutil/Packets.java
index f833694388..6bd9db8a9c 100644
--- a/src/test/java/testutil/Packets.java
+++ b/src/test/java/testutil/Packets.java
@@ -2,11 +2,17 @@ package testutil;
 
 import io.netty.buffer.Unpooled;
 import net.packet.ByteBufInPacket;
+import net.packet.ByteBufOutPacket;
 import net.packet.InPacket;
+import net.packet.OutPacket;
+
+import java.util.function.Consumer;
 
 public class Packets {
 
-    public static InPacket emptyInPacket() {
-        return new ByteBufInPacket(Unpooled.buffer());
+    public static InPacket buildInPacket(Consumer<OutPacket> contentProvider) {
+        OutPacket builderInput = new ByteBufOutPacket();
+        contentProvider.accept(builderInput);
+        return new ByteBufInPacket(Unpooled.wrappedBuffer(builderInput.getBytes()));
     }
 }