Got my motorcycle stolen..Police found the bike in parts..I am missing the main frame (chassis) and swing arm?

I got my motorcycle stolen and it was found parted out…I recovered basically everything but the frame and the swing arm..I hear that the frame is what your paperwork is on, meaning your title..I have a lean still on the bike and once I pay it off I will have the title…now do I have to go buy a frame that has clear paper work (meaning not salvaged) because I have to use that paperwork, or can I use the paperwork I have and use my engine as the vin number…not sure how this works…will have two different vins, one on the engine, one on the frame…also if I have to do the frame, will that make the bike whatever year the frame is?? so I could buy a newer frame and have a newer bike?? basically I need to know if my paperwork is fine and just use the engines vin number so I can buy a straight salvaged frame with no paper work…this way the frame is much much cheaper..

If you plan to use your parts on a new frame, you will have to get your paperwork to state motor and new frame vins to avoid trouble with the law. when custom builders put a bike together, the title has to state the vin for the motor and the vin for the frame if they dont match. same goes if you build a bike
when i wrecked my harley a few years back, one option for me was to order a new frame from the factory with a matching vin the same as the motor. insurance company totaled the bike, and i bought a new one instead.