Hey actually the common trading rules have changed a bit. For a number of items its best to leave them unid, and either trade them in that form or id them just prior to trade.

The main two items this would include (the 2 most important trade items, btw) are:

Tal Armors (because their so heavily duped/poofable) Unid then id prior to trade is just considered safer, and def not that important)

Shakos (no variable stats aside from base item def, so another good item to id and trade after shown to someone in tradescreen)