While generally that is one thing we consider when we authenticate, we are authenticating with our experience with the brand, and sometimes we encounter pieces produced from different times that we may not have seen before. We don't want to dismiss those bags as fakes simply because some details are off, because they may actually be authentic. Our decisions here may affect the sellers of those pieces and we want to be as accurate as possible in order to be fair to them. When we aren't sure, we simply acknowledge it.