Officially, no...but unofficially, probably. I used to work in concessions at a movie theater, popcorn is cheap to buy, and our inventory system didn't really track the popcorn dispensed, just the bags. Sure we might spoil popcorn that hadn't been sold if it was a large volume, but a handful of refills every now and then to the "wrong" bucket? No, that's not going to throw off the popcorn inventory estimates.
The reality is that most people aren't going to cram a popcorn bucket into their luggage.