The things I find, searching on the eBay:
“MYSTERY AUCTION. GET AT LEAST 5 UNDERGROUND COMICS”
“All very sexy with very hot girls. These are classic, collectors comics. No crap here.”
“Winning bidder will get web site address of my beautiful friend who is pictured in the auction”
And, true to the auction’s title, there is absolutely no indication of what “underground” comics are being offered. My hunch is they’re probably Eros Comics publications.