I sent about 10 items that were either brand new with tags or almost brand new. They accepted 7 of the 10. One of the items NOT accepted was a pair of Ugg boots that I wore about four times that were literally brand new. I inspected both boots before I sent them to Thred Up, in the original box with original stuffing and packaging. When I contacted Thred Up, they told me the item had a "small stain" and was rejected. And since I didn't opt to have the items returned, I don't get them back! Why would I opt to have something returned that was in PERFECT condition? When I called customer service, they told me that I was out of luck. They didn't care, they offered no solution, and were not worried about the negative feedback because they're "so busy".
Someone at Thred Up is wearing my Uggs, I'm sure of it. And from the comments I can see on this site, I bet they're a bunch of well dressed employees over there. I hardly think that my Uggs made it to Goodwill or Salvation Army.