I have seen samples like that as well. My sample is the worst - it doesn't have the 99999 - it has the wrong style number! I was sure it was fake because of that. The seller was a photographer who was given the bag for a photo shoot. It came with some documentation from the factory that supported his story and the ladies at tpf determined that was enough proof of its authenticity.
I think you would have trouble selling these though. We have seen fakes that don't have a number or have the 99999 so a lot of buyers would be leery of them. Some of them are scary good.
The seller you bought your bag from should have disclosed that it was a sample.
yes he should have and I think I am returning it unless he refunds some money back to me,