I was looking at this when it was on last time, before it was relisted. I can't comment on authenticity, but the receipt looks very similar to one that was supplied with another Uk PS1 sale recently. So I'd want to check the receipt genuinely went with the bag...
But in the receipt i can see Barneys New York. Is it the same with the UK PS1 too?
The receipt says Harvey Nichols (one of few UK department stores to carry PS1s) and the vat claimed stamp is in exactly the same place as on the other receipt which was an original. Unfortunately it's not possible on this pic to see the detail eg the date and time of purchase, so it's impossible to say if they're the same receipt. It was enough to put me off but i think if you want it a lot it's worth getting a better pic of the receipt and checking it's genuine.
The first fails on 5-6 of my checkpoints for authenticity, plus the seller mislabeled the item as Large and put up deliberately blurry pics.
The second PS1 is not authentic either in my opinion.
I can't comment on this bag but I bought a mulberry from 'the finer designer consigner' about 18 months ago. Shipped it to the UK. It looked ok to my then naiive eye, but later I sent it to the Mulberry factory in Shepton Uk for authentication (about 9 months ago when they still did authentications) and it was fake. So either they don't mind selling fakes or they can't authenticate. Too late to get money back, they wouldn't accept responsibility, out of pocket with a bag I can't and won't sell... and lesson learned the hard way!
I don't like posting receipt pics here, but if you pm me your email or if I can attach pics to a pm I'll send you the pic of the receipt from the UK ps1 from a week or so ago, as the seller sent it to me, so you can compare.