So basically I bought this gucci backpack off some guy on OfferUp, it's a app that lets people sell localy, and it had the middle metal part of the outside removed, you can tell because there's a few blots of hardened glue and a square mark there thats ripped. Anyways my friend checks for authenticity and he said besides that the bag is the exact quality it's supposed to be, YKK metal zips that unzip smoothly, perfect stitching (not a single thread out), and interior pattern is smooth and flawless. But the authenticity tag isn't there and the metal piece it's missing from the middle is pretty hard to find. So I'm asking if it's still worth anything without the tag? And is there anywhere where I can get the pieces I need to replace?