Fix able to get package from Cash shop surprise

Packages aren't real items and crash the client.

src/test/java/constants/id/ItemIdTest.java

@@ -0,0 +1,19 @@
+package constants.id;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+class ItemIdTest {
+
+    @Test
+    void isCashPackage() {
+        assertTrue(ItemId.isCashPackage(9102237));
+    }
+
+    @Test
+    void isNotCashPackage() {
+        assertFalse(ItemId.isCashPackage(4000000));
+    }
+}