Use Advanced search (link is next to the regular Seach button).
Search including section check off Sold listings (for just those that sold) or Completed listings (all listings that have ended, sold or not, tends to be less useful).
Buying formats section check Auctions.
In the Sellers section enter the seller ID you want to look at.
Then hit the search button at the bottom of the page.
This will give results for the last 2-3 months.
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