Need help! I bought a jypsiere from the Paris boutique in 2015. The bag has no stamp on it. I took it to the HK boutique and the sales there said it wasn't a problem that there's no stamp. I didn't insist on them taking some action at the time and now I regret it as I want to sell it. Would like to ask if it is indeed a mistake on their end, and if I have any grounds to insist on them stamping my bag? Thanks in advance!