at the end of the day some people have the best intentions and don't deliver, some are just out to get as much coin for nothing.
method of payment and tracked delivery mean very little to these folks.
i have paid and been paid via paypal gift several times and not let anyone down or been let down.
trust is a dangerous thing, nothing is guaranteed sadly.

on another site and he was a member on here too once, i sent an ecu for checking, the misses didn't send it recorded and he claimed it didn't arrive, this was as i had found a fault but couldn't fix for a fellow forum member. so i sent it off to someone i had dealt with loads of times, i ended up paying for a replacement ecu out of my own pocket, but later discovered this bloke screwed over his relatives for cash and many others around the same time.
so i end with trust no one, if you do have good contact details or a way to get your money back then proceed at caution.