interesting you say you've bought and sold on Tradesy. Have you bought many bags? I got one very nice MJ bag there is pristine condition a year or two ago. the price wasn't what I'd call cheap for the market but it was a fair price for the condition. not like some of the ones I'm seeing now where they basically want full original retail or close to it for a ten-plus year old bag with wear on itMy guess would be that there’s no way for them to authenticate every item because they’re not all in some Tradesy warehouse, rather many (if not all?) are being shipped directly from the individual seller to the buyer. It’s not like they could even just go off of pictures from the sellers because someone could easily provide pictures of an authentic bag in great condition but then send something totally different to a buyer.
As someone who has bought and sold on Tradesy and other sites for 10 years now, I’ve fortunately not run into any issues. But if I’m buying pre-loved, I treat it as my job to familiarize myself with the item and specific details enough that I can feel confident that I’m buying the real deal.
the prices on TRR are much better but I guess you have to be careful there. Posh has some good deals and some good sellers but again, each seller is different