Ok, most likely the cops documented the incident and it's up to you to initiate the prosecution. That's normally how it works in situations like this where the officers don't actually see the offense. Since there were no injuries the detectives probably cleared the case after you didn't show up at the station wanting to press charges. (I'm assuming that you thought they would just handle it and you haven't been down to stir the pot?)
Before you do what I'd want to do, go down in person with the report number and ask to speak with the detective that was assigned to your case. If one hasn't been assigned then ask to speak to someone about pressing charges. I'm telling you, we make LOADS of reports. Due to the volume we have to deal with, unless someone is willing to prosecute and actually shows this willingness then they are usually ex-cleared and made inactive.
Not saying it's the ideal way to handle cases, just saying that the volume of reports that most agencies of any size take demands this approach. There's simply no way that the detectives can take on every single reported case and push it themselves. Now, if you go down and try to push it and can't get anything done then that is just plain f'ed up.
Hope you get the results you want. If you were local here I'd see what I could do to help you. I'm useless to you if you're in Fort Worth, TX though... Sorry...
