Lol, amateur. Clearly you aren’t using the right coupons.

You have to order them to do it first. Something as simple as "put the money in the bag or else" on a note handed to a bank teller should do the trick, I've seen that work in educational documentaries on the television. The "else" here is putting a lien on their corporate strawman but you don't want to tip your hand too early by spelling it out.