They'll complain/look bewildered but little will come of it (probably) if you just do it once and weren't rude. However they can (not necessarily will, but can) revoke your membership for it, which you'll discover when you try to use the card at checkout or online. YMMV of course, but then checking the receipt is something you agreed to when signing on as a member. It really probably depends on how much of a scene it makes and if that stores stop loss dept takes note, which is likely tied to the value/fullness of the stuff in your cart.
I've done it before when busy, the line was long and I just needed tp (I was fortunate Costco was essentially my closest grocery store at the time). The girl doing receipt check looked non plussed and "Sir'd" me, I just smiled held up the receipt, told her have a nice day and kept going. No issue. Full cart might actually get a response though.
I've done it before when busy, the line was long and I just needed tp (I was fortunate Costco was essentially my closest grocery store at the time). The girl doing receipt check looked non plussed and "Sir'd" me, I just smiled held up the receipt, told her have a nice day and kept going. No issue. Full cart might actually get a response though.