What does that even mean? Nearly everything is copyrighted. You mean copyrighted by someone other than you? How would they possibly know who owns the copyright, unless they ask.
If they do ask, and discover you are not the original author of the works, they will ask you to provide them with a copy of the license allowing you to make copies. If you don't have a license, it would be a federal crime for them to ask you to pay them money for a willful infringement of the copyright owned by others. 18 USC § 2319
Parenthetically, Kinko's has its name on some of the most important federal copyright cases, so they are Extremely sensitive to what is and what is not allowed.
17 USC 106, 201, 501, 504, 506