I have a buyer that says he wants to buy some equipment but said he is waiting for a Paypal transaction to clear so that he will have enough cash. He said it'll be a few more days and said:
"If you want, I can give you a money-down right now of whatever price and then give the rest to you once I have it and then you can ship the lens."
If check my Paypal account (not relying on a confirmation email) and confirm the money is there. Is there any risk? BTW the guy is paying asking price and would ship to US. Does this sound like a scam or am I just paranoid?

