I need some advice.... (yes I'm an idiot I know ????)

A person added me on snapchat and we had been chatting back and forth for a good couple of months or so. Then they asked me if i could help them out. I said sure and they had told me that they cant get a crypto wallet setup and dont know why it won't let them set one up. So they asked if they could do a few transactions on mine. I gave them a throwaway account at binance.us but now I'm worried they might have been trying to con me. It was supposed to be a few transactions and i figured eh itll be fine i can just pay the applicable taxes no big deal.... then they deposited 15k in the wallet. I think they are attempting to get around paying taxes or try to move around stolen money maybe? They stopped talking to me so I've locked the account. There is approximately 15k worth of bitcoin in the wallet. What should I do? The account is under my name and the account was verified by my SSN and ID. It's bitcoin not fiat currency. So is this money considered mine? What should I do with it? Ive contacted binance.us to lock the account. I'm fairly new to crypto and I'm at a loss as what to do...