But still.. isn't that a dead giveaway when Sirius suddenly starts pulling vast amounts of money out of his vault at Gringott's that something's afoot? You'd think that a wanted criminal wouldn't be able to withdraw that kind of money.

This was kind of my point exactly.

I mean, fercrissakes, if the credit card companies see heavy activity on your account, they CALL you. Well, at least American Express does.