Do I get [?] boxes picked up by my local co-op partner?

I tested this today. I didn't pick up any [?] boxes, and my brother picked up about fourteen. I still ended up getting around two to three thousand credits though, so apparently they do count for both. :)

I was of the opinion that each player was allowed to grab the same [?] box. When I played through it online (other players in the same room), we both could grab the same set of credit boxes. When I picked it up on my screen, it remained in place on theirs, and vice versa. Oddly enough, they often weren't even in the same place, which leads me to believe that it is managed on client side. A local co-op game has a single client, so it is possible that you are losing creds when he picks them up.

Apparently chapter 5-3 is the best place to farm creds.