I haven't been on every project, but I'm going to guess that every project has a shred box. This is the box where you put pieces of paper that have on them things you have written or that the law firm has printed that are confidential. It's not a big deal. Very common. The idea is to maintain confidentiality. I think most folks understand that.
Not everybody, though. My new project has a shred box. It's where you're supposed to put copies of documents, notes, etc. that are confidential and need to be shredded as opposed to going into the regular trash. Only a genuine dipstick would put run of the mill garbage in the shred box.
Naturally, in that shred box are two McDonald's bags stuffed with the detritus of visits to that venerated fast-food establishment. Ah, contract attorneys.