[canada] Someone “accidentally” e-transfered $400 to me and is asking for it back over a month later.

I have auto deposit on and looking at my statements it was never reversed. Is it still possible for them to reverse it? I would much rather do that than e-transfer it back to him.

The texts he sent me: “Hello, I sent you an e-transfer by mistake on May 2 for $400 Any chance I could get the $ sent back to me?”

“I made a mistake on the last didget in the cell number when setting up a contact in e-transfer. Haha Thank you for responding, really appreciate it. The company the funds were supposed to go to just contacted me for payment.”

Seems legit to me, he gave me the same name that was on the e-transfer. He hasn’t been pushy at all like most scammers are. Anyone been in this situation before? I would like to give the poor guy his money back.