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.
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
It probably isn’t stolen. It’s more likely delivered to another store, still on the truck, still at the factory, or was sold and not recorded.