This is speculation but I bet a lot of sellers were booted from ebay and then go to Poshmark. I've seen many of the same fakes listed on PM that were removed (often multiple times) from ebay as a result of reports.
And if they're also reneging on sales, ebay will eventually NARU them and as you've found, it's possible that your seller might be one who just moved to PM.
You hit the nail on the head!! Another pair I’ve been stalking for years appeared on poshmark but it’s in poor condition. Seller really wasn’t very cooperative about it. I asked how many spikes were missing and she said none. But there were over 10 missing in just the views shown in her own listing. So I took screenshots, circled them, posted them, tagged her. She was apologetic and said she hadn’t noticed. I deleted it. But then she wouldn’t get back to me about posting complete photos or even tell me the total number of missing spikes.
She wouldn’t ever respond to me on her listing. If I asked a question on her listing she’d go find one of mine to answer me. So nobody else viewing her listing has any idea what’s going on either. Finally I told her that I would pay her full price if she fixed them first, that way I wouldn’t insult her with a low offer to cover my repair costs, of which I had no idea how to estimate since she won’t tell me or show me how much damage is present (plus they’re dirty, yiiiiich). She said she had no idea where to fix them and to submit my offer. So I offered her 55% ($500) which is more than fair in my opinion given the risk I’m taking on their condition and her unwillingness to cooperate.
During this exchange, half scattered amongst my listings and other half of her actual listing, I explained my cobbler won’t even repair spikes unless I give him the replacements. I asked if she had them with the heel taps, how many, if it would cover the unknown number missing on the shoes, and that I found a limited supply of them available for purchase but they were $20/pair (as in $10 per spike sold in pairs) so if she had none it would cost me at least $120 to buy the spare spikes before my cobbler even started repairing them. And that otherwise I was going to ship them to leather spa in NYC (from Vegas) bc they do excellent repairs but it’s $$$ for me.
End of long story: she countered 800. I said no way was I going to buy them in that condition for 800 and good luck. She just posted them on eBay last night for 900 and sure enough, she has whopping total of 5 feedback ratings (all older than 12 Mos so I can’t see them) totaling 0%!!! You were sooooooo right!!
AND she lives in Brooklyn so she could totally get them fixed and get her asking price.
I already knew that she was Shady McShadington by responding on my listings instead of hers and that if this transaction took place it was going to be a PITA. But it was sooooooo much easier to assess my risk dealing with her on eBay, where she has 0% rating.