[Us] I tried to sell some pins for $43. This person has sent me a total of $323. More on photos/below

On FB I listed some pins. This person wanted two of them, totaling $43. They gave me their address and info, but did not pay to my PayPal. 24 hours went by so I messaged them and told them I needed payment and that other people were interested in the pins. I gave the person my email and the QR code to my PayPal. Gave a time limit and nothing. An extra hour later, I said I need payment in 30 minutes with either PayPal or Venmo.

They then sent me $280 to my Venmo. I have a photo of that convo on the last slide. Then after I acknowledged it they sent me ANOTHER $43, so the total amount is $323. They did not send this payment with goods and service protection. They did friends and family. Now their newest message to me is “can you send PayPal 43 PayPal?”

What could be the play here? Is this a scam? I don’t want to do anything until I know.