With grandma's permission, here is the first check printed by the scammers and processed by WaMu to withdraw funds from grandma's account. I've black-barred my grandma's personal information and some numbers on the check to protect her identity as much as possible.
The three black bars at the upper right conceal her name and address (which was not entirely correct -- her apartment number was missing.) She said that they had her account number when they called.
Note: this is not a check from grandma's checkbook, there is no signature, no check like this had even been used by my grandma before, the check was printed by the scammers themselves, it was cashed at bank in Cleveland -- on the other side of the country. Yet WaMu still transferred the funds out of my grandma's account and called the transaction legitimate.