I always wear Levis 501. All real Levis 501's have the red tag on the rear pocket with the words "LEVIS". One pair was sent to me with a blank red lable, this pair is a fake (in my opinion) and not real Levis. As always, Amazon has a really great return policy, the best. I just went online and printed out a return address label. They send a replacement pair (of real Levis, as per my request) before I had even sent out the return pair, all at no cost to me.
Things happen, but Amazon had the best return policy.