My boss (a lawyer) got caught in a scam about 10 years ago. I was on vacation, a temp was filling in secretarial duties. She got a weird feeling one morning and went into boss's office and found a well-dressed gentleman in there (boss was in court). Our office set-up is a bit odd (very old building) so it is not completely strange that someone could walk into boss's office without going through secretary - especially if boss left his door unlocked, which he did all the time. At any rate, she told Mr. X that boss was in court, come back later.
About two weeks later, boss got word that his bank accounts had been drained. Apparently, the scam worked as follows: Mr.X visited my boss's office and another lawyer's office or two (trust accounts, you know!) and stole trust cheques (not from the top of the deck, but in the middle, so the theft wasn't obvious for a week or two). Then he and his accomplices visited a number of rural mailboxes and stole some check reorders from ordinary citizens.
So, Mr.X lines up in bank, makes deposit to boss's bank account with cheques from lawyer #2 and ordinary citizens (maybe $2,000 or so). Then Mr.X says "holy smokes, I forgot I need $500 for XYZ"... as the teller just saw him deposit $2,000, she gives him the money. Rinse and repeat for each account...
My boss is still really bad about leaving his office door unlocked...