You have to be willing to treat Posh like social media -- and talk back and forth to the seller. Here's how it goes:

Before buying, check that the seller has logged in or made a comment recently. If they have not, they may have started selling elsewhere or just forgot they even had items up on Poshmark for sale.

If the seller has not been active on Poshmark site for a while, and you really want the item (cant find it eslewhere)-- then make a comment on the item asking seller if she's still selling the item. That may reactivate her--she may get an email from Posh saying she has a comment from a customer.

They used to have ratings (called Love Notes) that would help you know if the seller was reliaible and shipped quality items. You should check it first before you buy----but I can't find the Love Notes ratings anymore. I don't know if they moved them or did away with them. I am trying to find out about that --because reveiws of sellers are needed on any online site.

If you don't get an email that you item has shipped in a day or two--comment to the seller. (They have a max of 7 days to ship with tracking.)

If they don't ship within 7 days, you can cancel the order and your refund is deposited back in your Paypal or payment method.

If you love the item and don't want to cancel--you just have to keep bugging the seller until you get the item shipped or decide to cancel.

If the item is not as described (wrong size or damaged more than stated), open a case with Poshamrk and send a photo of the item and what's wrong. They will refund your money and give you a label to return the item to seller. I think if this happens a lot they will suspend the seller but Im not sure.

Give the seller a rating after your transaction to let others know her faults (slow shipping etc) and/or good things about dealing with her.

I have bought items not as described then the seller blocked me and trying to show a fake sterling necklace is near to impossible.