[ghaff]

I don't have a membership to any of the warehouse stores any longer but they seem to be the only places that routinely check receipts at the door in my experience. It's unclear to me why they feel a need to do this when Walmart, for example, doesn't.

[burger_moon]

It depends on which Walmarts you shop at. They often have people checking receipts at the doors but you can just walk past them.

[gtk40]

From my experience, larger/unbagged items seem to be what they stop you for.