I found two sites you can use to register your trike or look up a trike you want to buy to make certain it's not stolen. They are:
National Bike Registry http://nationalbikeregistry.com/
Bike Index: https://bikeindex.org/for_law_enforcement
Both can help a stolen bike that is later found be returned to you. Police departments usually auction off found bikes because they cannot find the owners. Many on here would rather take the insurance money and buy a new one. I have added over $800 in modifications/customizations to mine. I'd have to start over and don't ever want to do that.