most likely they're emptying the shells for the powder and pellets to put in a booby trap. Not sure why they felt it necessary to smuggle these in this way.

*This is why every parent should check their kids candy after a night of trick-or-treating.

I bet they could use a cat too.

https://i.poastcdn.org/07c0dce5730fbab2230a28648cfd49d5197efb4e4a91962ed1137d200e36755b.webm