I don't mean to further alarm you, but, in expressing my personal view, it doesn't look good.
You'd be hard pressed to find me consider buying from anyone without a long history here for too long, much less a first-poster (not to say that a long history necessarily means much either). The guy in question's full post history of 6, here, was all done on the day of registration and were all sale propositions, most of which expressed an urgency. He hasn't posted at all since then-- not even further sale offers. In the context of you post of concern, it would seem to me that he wanted to get as many transactions started, simultaneously, as possible so that neither buyer would have any other instance to refer to until it was too late.
In addition, a recent snafoo in which my grandmother had money stolen en route to our mailbox, lead to me finding out that even sending mail from here (Miami, FL) to the Lesser Antilles (the trail of islands including Barbados and Trinidad on the eastern end of the Caribbean) only takes two weeks, max. In contrast, I'd think thirty days is a little long for mail (ground or not) to make it from coast to coast.
Again, I don't mean to sound as if I can authoratatively tell you what anyones intentions are, as I can't, but if anything were to smell fishy, this would.
Just how do money orders work, anyway? Still don't know how all those payment options function (cashier's checks, bank drafts and whatnot).
Best of wishes,
DISCLAIMER: I don't yet actually drive a BMW. Currently, I proudly drive a '93 Volvo 940, the inspiration for my love of RWD cars.