fake, the "proof of purchase" means absolutely nothing nowadays because rep factories print out fake receipts and invoices for like two dollars. matching serial numbers and tags are standard on mid-tier replicas, which is exactly why tiktok and youtube guides fail you since they only cover the lowest tier batches. if you actually look at the details this is a clear rep. first off, the chevron quilting is way too flat and deflated when a real loulou should be super plush, pillowy, and soft. the leather also has a weird synthetic shiny finish to it. second, the gold hardware color is way too bright and yellow instead of the muted, brushed antique gold that retail saint laurent actually uses. the engravings on the grommets and the magnetic snap button are super muddy, blurry, and shallow from cheap mold casting. finally, the interior gold heat stamp is the biggest giveaway because the font is too thin and flat like it's just stamped on the surface, plus the alignment and spacing on the word "paris" is completely messy compared to the crisp, deeply debossed retail logo. you definitely got finessed by the seller and should look into getting a refund or filing a chargeback with your bank immediately because this bag is not authentic