Yup, my 73 has it on the body on the inside of the driver's door too. Only place I've been able to find a VIN to match the title (strict here in Mass too). Mine isn't metal, its paper with a cheap plastic covering thats been taped back on...I'll have to be careful when I go to work on the body or I may not be able to register her!
Jay
95 Wrangler Rio Grande, BFG 30" A/Ts, basically stock
73 Commando, 304/TH400/D20, basically stock and rusty