UPS refundable additional insurance fee? SCAM

Lol I (LAD) laugh all day at I won’t buy from Facebook guys. I put a set of rockers on Facebook last week and got 550.00 cash delivered by UPS today and his rockers go out tomorrow. Tracking numbers given incoming and will be out going. Pretty sure I sold a 1150 dominator tonight. Lol. Stick to your guns guys.