Make a police report ASAP! The sooner you get it entered into the system the better. Since they have the title they might try to transfer ownership. If that happens before it is entered into CLETS, it could be considered a 'civil issue'.

One problem you have is that when the police put out the BOL (Be On the Lookout), most cops probably are not going to know what the heck a VX is. My coworkers are always asking me that eternal question...

Good luck.