Sold iPhone XR to someone who got scammed

I sold an iPhone XR through Facebook marketplace set a wanted me to overnight ship it it cost me $110 upfront the buyer supposedly made payments to me of $300 and then was told by a different email from Venmo to send another $700 we were both confused but he did it anyways and I guess got scammed for all of the moneySo he’s out $1000 I am out $110 he’s got the phone and wants me to send him $50 to mail it back to I said I send him 10 he keeps asking for a steam card what can I do if anything about getting my phone back or blacklisting it or being reimbursed the overnight shipping I mistakenly paid for up front ? Any input is greatly appreciated and I understand that I probably made an idiotic choice so please don’t put your two since in about that Karen