I recently bought a speedy 25 monogram on Poshmark for $725. It comes with a dust bag, and "original receipt" date code was SD2104 but she said she bought it in Feb.2015. Anyways, if you are not familiar with Poshmark they authenticate items above $500. The seller is required to send the item at the Poshmark Headquarters first for review/authentication called concierge. Then if they determine that the item is authentic they will mail you the bag etc. My question is should I trust their concierge alone or should I get a paid authenticator to authenticate it again? I usually get my preloved items authenticated here if it's bought from ebay and sometimes caroldiva if the item I buy is from a friend. Have you had any experience with Poshmark concierge? Thank you for your input.