Ditto the above counterfeit check (personal) experience of Audio Limits. Look, these crooks are getting so sophisticated that banks say they've cleared...and yes, the bank lobbyists have written into laws that even up to a year later the bank can seek recourse, send your account off to collection agency and the nightmare of that haggle! It happened to my son - and I told him just to make sure it cleared. That bank assured him it had cleared at both banks and it still happened. Just like in the movie, "Catch me if you can", there are still problems in the checking system. Crooks are gaining the upper hand again in the "game". Online is their latest exploit.
So, I second audio limits in saying bank transfer only!!!
Oh, and you'll find shipping speakers internationally is way too expensive to make any sense.
Insist on speaking with the person and you'll figure out pretty quickly if he has a clue about hi-end audio. Never use the "buy", instead use, "make an offer" so you can choose whom to sell to.
There are lots of scammers online now....even on audiogon.