Used items can be sold on Tophatter, with the following exceptions and requirements.  

The accurate condition must be disclosed when creating a listing.  Used items may not be sold in some Categories.
  1. Used Beauty items cannot be sold on Tophatter.
  2. Used Intimates Apparel cannot be sold on Tophatter.
  3. Used or unsealed Edibles cannot be sold on Tophatter.
  4. If an item smells of smoke or other odors, or the item is stored in a smoking environment, that must be disclosed within the description.