I would be very surprised if they are authentic, please let us know if you do go ahead and what the authenticator comes back with.
My personal experience has been negative - I bought a Celine and when I got it authenticated it came back as FAKE. ******* did come back multiple times to state that they only sell authentic . Luckily I paid via Paypal so I was able to raise a dispute and escalated to a claim. Paypal's decision was in my favour and I'm able to get my money back. That said I believed a few people on this thread also bought Celine from ******* and it turned out to be authentic....so that's why I said be very very careful (some may be some may not - get it authenticated if you decide to buy)....