Audiogon Ethics

I have been an Audiogon member for a couple of years and am very fond of the idea that we are building a community of audiophiles based on trust and honesty. I recently saw a sales ad for a piece by a member who I sold an identical piece to a few months ago (I can't say it is my original piece but it would strike me as odd that someone would own two identical units). If the seller is indeed advertising the unit I initially sold him, he is misrepresenting the condition of the unit (e.g., implying that he purchased it new and that its age is less than it actually is). My question to everybody on this list is what, if anything, to do about this?

I am concerned about the implications of dishonesty for our community of audiophiles in general. I believe this question merits discussion among members. I look forward to your responses. Thanks.

Volker