The best way to differentiate a Fender Custom Shop Masterbuilt guitar from a Teambuilt is to check the logo stamp behind the headstock. A Masterbuilt will always include the builder's signature with the logo. Teambuilt models do not. Check that first. Then check the Cert and serial number. Fender Consumer Relations 1 (800) 856-9801 can verify a ser# and provide background info on an instrument. I've gotten immediate verification from them.