Usually, if it's a scam, you will get an auto reply, saying something like.... Dadadada, yes, we know it's under book value, but need to sell due to death in the family, medical problems, son who is overseas, etc, etc.
If you get an email, and are uncomfortable with it, just send it to your junk folder.
As long as you gave no personal information, don't worry about it.
I recently replied to one on a drastically reduced price on a Monaco. I sent him a good luck on your scam email, reported it to CL as a scam, and haven't heard from him again.