Hello, I was wondering if any of your serial #'s have ever faded? I just recently had a metallic Work that was shipped to me and everything looks great, but the serial #s in the back are practically gone (the few numbers I could make out match the number on the paper tag, but I've never seen this happen to any of the Bbags I already own). I've posted pics in the Authenticate This! section, but thought I would put a posting here as well. Thank you!