Received €300 from a cancelled P2P transaction. Buyer blocked me after I refused to send USDT. What should I do?

Hey everybody, I want some recommendation on a sketchy state of affairs involving a Binance P2P transaction. I’m pretty positive someone tried to tug a triangle scam on me.

It started once I was making an attempt to sell USDT for EUR. I found a purchaser with a reliable-looking profile and opened the order. He greeted me and stated he was proceeding, but time ran out and the operation was routinely cancelled. Abruptly, he messaged me saying he despatched the money anyway and sent a screenshot. I checked my financial institution and nothing was there, so I informed him it didn't arrive, that the order was cancelled, and requested him to please not do anything. He insisted he despatched it, however I couldn't see anything, so we left it at that.

Two days later, €300 truly hits my bank account, and I acquired a message from him asking me to verify. The cash was there, but my gut advised me one thing was off. I informed him I might return the cash, however only by way of a direct financial institution switch again to the precise origin account. He refused and stored insisting I send him the equivalent in USDT as an alternative.

Because of this, I referred to as my bank to request a reversal. My financial institution advised me they couldn't do it on their finish and that I needed to manually switch it back myself. I made a decision the most secure route was to inform the customer to go to his bank and request the reversal himself. But once I went to message him, I noticed he had already blocked me.

I have formally reported the consumer and the transaction to Binance help. Now, I’m just sitting right here with €300 in my bank account. Ought to I simply depart the cash untouched until a bank or the actual victim claims it? Has anyone skilled this actual state of affairs before? Any advice is appreciated!