They just want to avoid any legal issues. And for all they know maybe you're a corporate employee testing them. I don't know if they do that but they don't give a rat's ass about you other than they have rules and want to keep their jobs.
If you really want them to do it I would say cut out the copyright and take it to another kinko's. If they ask what got cut out, tell them that you started cutting stickers out but wanted to make copies in case you messed up.