If you don't want it, take it to your local PD and let them handle it. Probably best to call ahead first!
Just the other day a woman pulled up to a local fire station, put kind of a weird box or container on the ground, waved at some firemen and drove away. They thought it was suspicious, called the Bomb Squad, and of course it was just some memento's a fire station might enjoy and a thank you card for their service.
If she'd just freaking said, "Hello, hope you enjoy these gifts..." it could have been avoided.
So, yeah I +1 MDinana on giving 1st Responders a heads up or face to face before dropping anything off.