New Computer Mice

My computer mice kept breaking one after another, so I finally ordered 10 of them online. This way I would get a volume discount, all 10 for just 30 bucks total, and the shipment just arrived today. The problem is that they are marked "No warranty Sold as is," and all the part numbers are crossed out with a permanent mark for some unknown and obviously sinister reason. Now I am thinking maybe half of them don't work? Perhaps I should resell them to other people before I undo the packing. I have a new motto now, "if you think something doesn't work, sell it to other people."