Tamperin' with tamper data
Hey Gaians, wanna help me out? 
Trying to figure out how to fake an item in the trade window, like we can do with the item box. Only problem is that I can't figure this out (I'm working with a trade between mules).
%7C7171%2C1331008411
The part in bold is item ID, but what is the part I underlined...? >.< Anyone have clues? If I figure this out I'm editing this all out and putting a guide in the UG.
EDIT: Just tried changing item IDs with a Demonic Wind, and got an error: "Item ID, Serial mismatch"
So where can we find the serial?

Trying to figure out how to fake an item in the trade window, like we can do with the item box. Only problem is that I can't figure this out (I'm working with a trade between mules).
%7C7171%2C1331008411
The part in bold is item ID, but what is the part I underlined...? >.< Anyone have clues? If I figure this out I'm editing this all out and putting a guide in the UG.

EDIT: Just tried changing item IDs with a Demonic Wind, and got an error: "Item ID, Serial mismatch"
So where can we find the serial?