That's very hard to keep track of. When you get bonds, you get bonds. There's nothing saying "you got bonds from XX and YY". The bank's the exception.
All you need is to add a second database column to "gold" and "bonds" called "fraud" or something. Whenever the lord tries to change bonds into gold or send bonds to someone else, the script (whatever you call it when the button is clicked) checks to see if the "fraud" column is nonzero, and if so, notifies the lord and deducts those bad bonds from their count. Probably best to fail the transaction entirely, so that sending 50 bond doesn't turn into sending 30, or causes a negative bond count on the lord or something.
