Unsolicited Deposit in Cash App

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I’d love some input here. In February, I had someone deposit $400 into my Cash App account. It’s not an account I use often, nor do I use the email address associated with it. When I did check that email I found messages regarding this deposit. Basically, there was a notification about the deposit followed by 3 messages frantically asking to refund the money back to the depositor. After Googling this situation, it kind of sounds like a scam. Sort of like laundering money. Stolen money goes in, and “good” money goes out as a refund to the scammer. Then when the bank finds out where the stolen money was deposited, they withdraw money from your account to pay the victim back. This is AFTER you’ve returned the money that was “accidentally” deposited in your account. I’m not sure how a bank can pull the money out, but maybe they have ways. It’s all pretty convoluted if it’s true. I’ve called Cash App support to see what they say about it, and they think this guy was legit. How do I know, though? How do THEY know? I’m torn…