I think we can all agree that LW's purchases are just not that interesting, and that if they were she wouldn't be getting a receipt. We can also agree, I think, that unless they're fugitives from justice or part of the witness protection program they don't really need to shred all the evidence of their lives, every day.

So what it comes down to is this: Is this the only weird, insulting, and vaguely controlling thing he does or not? If so, it might be better to just let him pick through the garbage and maybe suggest he see somebody to talk about whatever is causing him to be like this. If not, or if LW isn't sure, then she should seek counseling and/or a divorce attorney.