This is just a hypothetical scenario I was thinking about while showering (the best place for thinking). If you’re lifting with another person, you could go in separately, you grab the target item (to conceal or not to conceal?) while your friend shops around like a normal customer. Next, you go to the bathroom and remove the packaging (if necessary), text your friend that you have the item, where you’ve left it in the bathroom, etc etc. You leave, your friend goes into the bathroom shortly after you, conceals, then leaves. The only person the LP would stop is you, and you don’t have the item on you.
One other thing I thought about, you could bring an “out of order” sign to put on the stall door when you leave, that way you don’t have to worry about some random person walking into the stall and seeing the merchandise you just stashed.