Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

I received $1000 and was asked to send it back. How was this scam meant to work?
The initial story sounds normal. Happens every day. Checksums cannot prevent this, since it is a typo by the sender. The sender typed in a wrong account number. That account number happened to exist (so the sender wouldn't get any immediate error message), your account. But, that innocent story can also be used as part of a money laundering plan. Namely, to give the money a legitimate source. Also can be used in a scheme to frame you for something. The question of how the person got your phone number raises suspicion. The bluffs to avoid the normal paperwork, and then disappearing, make it incriminating. No doubt. Take this to the police. The question arises: even if the plan (whatever it was) failed, why didn't he do the paperwork and get the money back? The answer is that that would leave a trail to possibly be picked up in a future investigation.