Almost all LP is undercover: you won't know for sure who they are until they stop you. This is the only way they can be effective. But yea, Co$tco stuff is bulky and hard to lift, plus in the one Co$tco store in my area there are no self check outs so the only way to lift is to either conceal or walk out. And they have receipt checkers at the doors (not greeters, these are store staff and they ask you to stop for receipt check).