Hope you'll be able to work it out with the seller.
This one
could be authentic. No way to tell for sure from just two photos, though. However, if it is, then it's one of the first PS1 bags that came out, so it's from about 2008-2010. It also has black painted hardware which looks great when it's new, but is prone to chipping as you can already see in some places in these photos. That's why it was later changed to gunmetal. No way to tell for me if it's a Medium or a Large, will have to see the bag from the back.
If you decide to buy this, please post pictures that are front-facing and well-lit and Ellie and I will take a look.