Too funny: a quick search for AGS Authentication brings up no company website, but the only related hit was a thread on these very boards (seems to be happening to me more and more).
http://www.net54baseball.com/showthread.php?p=838274
What gets me about the one I posted above is that it was a cut from a check made to look like a major company made the cut card, and that this company (AGS, or hopefully confused with PSA if you didn't look too closely) authenticated and slabbed it. Looked slick from top to bottom for sure.
Of course, I now know why it was only a 1 day auction...