Not an enviable situation, for sure. If in the modifications all the decals have been removed from the interior or the dash board serial number obscured , the unit could be nearly impossible to sell due to re-registration issues.
If when you look through the lower drivers side corner of the windshield you can see the serial number through a rectangular 3/4" X 3" slot in the dash panel, post the first 12 numbers of the 17 you can see and maybe we can decipher the year and chassis info.
Can you provide any info , Gas engine or diesel , has the exterior been modified?
If the exterior is basically stock, maybe you could post a picture, and someone could help identify.
Info on posting photos , is in the " FAQ " drop box in the blue bar below your welcome message.