I shopped for my last pair of Persols in a chi-chi retail shop, noted the model # and than bought them for $60 on eBay instead of $235 retail. They are not fakes and the seller on eBay had several thousand transactions, so I highly doubt that they were stolen.
As on any eBay purchase, you need to get in writing that they are authentic/not fake, either written in the listing or in an answer to question thru email and pay w/ Paypal. If they show up and they are fake or used when supposed to be new, etc., it's charge-back time.