In short. No. Our store fully guarantees every signature we sell. Any signature that is rejected from a major authenticator can be returned for a full refund including return shipping costs. We could print out some generic COA, but honestly, these days, a personal store COA is pretty much worthless. When buying autographs, you should trust the seller's reputation and return policy over a piece of paper. The only exception is PSA Authenticated items or a document from the celebrity himself/herself, which I will include if available. If you have any questions, feel free to send me a message.