我卖过好多次了， 都是local的人买， 很容易识破骗局。 坚持一下几点

1. Ask them to provide a mobile number and email 
2. email to communicate and also speak with the buyer on that number
3. Use text messages to make sure the number is a genuine phone number ( phone number can be spoofed) 
4. Google both the email and phone number - I always can find traces that point to the buyer's "whereabout" and "whatabout" in the local area.   

Under no circumstances a deal should be reached without human interaction