I wonder why you aren't able to access the GB Advanced section & see completed sales. I just used it a few days ago w/o issue.
MAYBE,, just MAYBE,, (and this is a wild guess from a guy who's not very computer savvy,) you didn't "highlight" the "completed" side of the search page.
I did highlight it - every time
I'm probably just slightly above average computer savvy, and for the life of me I can't figure this out. I used the Avast browser, the Chrome browser, Microsoft Edge all with adblock disabled - every time the same message:
No results found or search too broad
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No problem when I click on items currently for sale, plenty of Old Army's come up.