There is a recommended form on the VFOIA site. I'll see if I can find it if no one else puts it up.
Just a suggestion. Forget the pleasantries. Be specific about dates, time, people involved, just what you want. With the State Police specifics are very important. I've had difficulty getting dashcam copies. They have always claimed they were privileged and I have to file a complaint (Which is faster than court action).
It helps to copy the head of the State Police because I've found some of the Division Commanders are true BS artists and figure you may go away.
Also give them a preferred format you want it in. I got recordings from a SW Va. PD once that was in some alien encryption. It took half the night to find something to convert it to an AVI.
Leave the legal threat out. They know the law and the difference between being tough and sounding tough, is you just hit the other fellow without talking about it.
In other words, if you don't get it as prescribed by law, move to the remedy.
You might want to start carrying a bag of doughnuts with you.