nutildah missed an important point for you: most imposters try to impersonate higher-ranked members with a new (newbie) account. Whenever someone like that PMs you, you'll see this at the top of their message:
!!! WARNING: This user is a newbie. If you are expecting a message from a more veteran member, then this is an imposter !!!
I'd steer clear of any accounts like that if you still want to trade coins on this forum.
I'm willing to bet their conversation happened over Telegram, and the scammer deleted the conversation before OP had a chance to screenshot it, which is why he never posted the screenshots. It didn't occur to me I should register my name on Telegram before a scammer takes it -- until after it was too late.