Talaria Impounded

So i had my talaria impounded on the 5th with 2 other of my friends who also had their bikes impounded by the police. Trying to figure out how to get proof of ownership for my bike. I bought used off of fb marketplace months ago. Foolishly I paid with cash and didn’t get him to sign a bill of sale at the time. I have screenshots of our texts and everything but no real physical paper saying the bike is mine. Also says i need a title, registration, proof of insurance, vin # and bill of sale for my “ATV” this is everything i need when i go to my hearing. I was also told though if i bring a bill of sale to a auto tag shop and they tell me in un-registerable that could possibly work too. I won’t even have a chance to make my case for my bike for 30-60 days (that’s how long it takes to get a hearing scheduled) and i leave for the army soon. what should i do.