Try this for starters:
http://www.state.nj.us/mvc/Vehicle/SpecialVehicles.htm
"Special vehicle" titles
The following are designated as "special vehicles". They require titles but the process for titling them is unique.
* Reconstructed vehicles-dune buggies, kit cars, etc.
* Glider kits
* Salvage vehicles
* Vehicles with missing VINs
* Vehicles registered to the military
* Vehicles purchased from the federal government
All initial titles for the special vehicles listed above are issued by MVC Central Office in Trenton. Call (888) 486-3339 toll free in New Jersey or (609) 292-6500 from out-of-state.
>> I am guessing an abandoned vehicle would fall under a similar category as a salvage.