99.9% of the time, when you read "as-is", "untested" in an auction, it means the seller has tested them and they don't work.
But he knows that he'll get more money selling them as "untested" rather than "broken" so he pretends that he hasn't tested them and lists them "as-is".
If they worked, you can be damn sure the listing would say "100% tested and working Amiga 3000 motherboard".