I often think that must be the case. There was that seller of small Coach items who always had items before they were released in large quantities. It took years before they shut her down.I bet a lot of those new, not fake eBay bags literally fell off a truck, probably a good supply of those at the moment... http://www.nj.com/essex/index.ssf/2016/12/truck_hauling_500k_in_purses_reported_stolen_from.html
I bought my purse before the date of that reported theft, so it must have been a different truck!