Oh, heck...the cost would be negligible in the greater scheme of things. You know how much cruise missiles and attack drones go for? Besides, the FBI gets paid a certain amount regardless. They have a yearly budget, and you can just bet they make sure to spend every cent of it by year end, just like the private sector does. Consider the money gone, cos that's what it is...gone.
By the way, we've phased pennies out in Canada. They're gone now. Out of circulation. They did it because it cost more to make them than what they're worth, and people were getting to the point where they'd just ignore them if they were lying on the sidewalk. Just thought I'd mention it as a matter of general interest.