[zarq]

Or someone has it on their cart on the way to the checkout.

[nucleardog]

Or someone had it on their cart on the way to the checkout, changed their mind, and somehow managed to cram it in a freezer behind some milk or something.

[barkingcat]

this happens at Ikea a lot - people take the thing and then decide they don't want it... there's a lot of places for things to go in the warehouse pickup section of an ikea store