Some months ago I ordered a duvet sheet set online. I received two sets, but had only paid for one. I kept the extra one.
My husband used to be a terrible hoarder. He kept old newspaper clippings, cinema tickets, skanky old concert t-shirts, the lot. He never kept them in any kind of orderly manner, which made it even worse, but that did mean that it was very easy for me to throw tons of his shit out without him noticing. Over the years he has occasionally questioned where something had disappeared to, and I'd look all innocent and say that if he'd kept his stuff organised things wouldn't go missing. He never missed the vast majority of the stuff I'd thrown out, though.