What is "low ball"

no, you're not overreacting.

I wouldn't ship the item until the check clears at least 30 days (in case it's a phoney ) this way you'll still have your item. Don't ship until you cash the check. Even a money order can be reversed if a person pays for it by check and not cash. Be careful. Have you got the all of the buyers info? I'm just sayin'..............

I don't see anything fishy at all. I'd give him all the personal information he wants to know and throw in my PayPal password just in case he might need that as he was ripping me off.
Just make sure your bank can process checks FROM NIGERIA!

I didn't engage him at all. Just too many oddities in a generic email. Offering $50 more and telling me to cancel the ad. Having his mover pick it up? Just seems like someone looking to cause trouble. Will his mover need my social?

In regards to low balling, if the buyer has a decent price but says B/O, I think it's fair to ask them to include shipping or to go for 5-10% less.

I've listed nice gear in the $4k range that sold in hours with a few $1500 offers in there. Wishful thinking, but I also think that some of these people are just looking for interaction. Maybe they don't get out much.

Classic scam to procure your personal information. Do not even respond to it.