Introduced the ability to detect items in other trades. Please note that items work differently from pets on CS. Pets have unique IDs, meaning each pet is one-of-a-kind. When you search for a pet ID, it's the only version of that pet, and trading it away will automatically cancel any other trades containing that same pet. Items, on the other hand, do not have unique IDs. If you have the same item in two different trades, it won't automatically cancel unless you only have one copy of the item available.
