It depends on the part of the system you are talking about. Under the covers, many a system will send reports higher up for 5 figure transfers, just for money l

It depends on the part of the system you are talking about. Under the covers, many a system will send reports higher up for 5 figure transfers, just for money laundering detection. And there will be all kinds of things blaring for anomaly detection. It's not the same if an account that normally moves large sums, and has been cleared and "explained lol moves a large amount than if it's one making nothing. See, for instance, how Notch's PayPal account was flagged when suddenly the game started to do great sales. So the special attention will vary, and there might be a human involved at some point even if they don't call you.