Guys, this really sucks, but please understand, whenever you propose to send any form of money to anyone (or receive it in return for goods), make sure you verify exactly who you are dealing with and what the terms are, otherwise, all bets are off.
I used to sell used high-end audio gear via the internet and scams were common. A critical part of every transaction was verifying the legitimacy of the buyer. I received bogus bank cashier's checks, bogus USPS Money Orders, a bogus bank wire statement, plus there were various gambits I was fortunate enough to either circumvent up front or not be approached with.
The world contains no dearth of dishonest people and the non-reversible nature of cryptocurrency payment provides a great opportunity for them to make hay! If a transaction is proposed, then find an alternative means to verify the particulars (email? Phone?) -- don't take it on faith! I've called many a foreign bank in the past to verify a received Bank Check was good! Trust is great, but there's just nothing like verification (not that there's ever a guarantee, it's a question of pushing the probabilities as far as practical in favor of an honest transaction)!