Unwanted physics on a mesh

[venajiro]

I created a mesh for a container I wanted to make using Outfit Studio because it seemed nice and straightforward. I made a little stack of cigarettes and cartons and got it in the game just fine, but I think the physics from the cigarette pack I started off with has applied to the whole finished container, which means I can pick it up and toss it about. I'd like to make it so it can still be interacted with as a container but it can't be picked up or knocked off something. This seems like something I should be able to fix in Nifskope but I'm really not sure how.