If you're a seller & I click on "view Items" which is under your name, I can see what you have for sale. Ebay used to have completed items also, but now instead of just clicking on completed listings, you have to go to advance search, put in the seller's user name, click the box for show completed items & enter.
If you click on the seller's FB #, it takes you to their FB, so you can see how good (or bad) their FB is. FB will show the item sold & how much. The more recent FB will let you view the listing.