My CJ with replaced tub passed IN police inspection for antique plates and the vin tag on the firewall was not even in place- I had it in the glove box because I forgot to pop rivet it in place. He never checked - he only looked at the vin tag on the windshield frame. That too had been swapped over but the whole plate it bolts to was swapped to the new window frame.
I only paid $1200 for my 94 YJ with 95K miles - but that was up in Chicago and it had lots of little issues and rust (but I did drive it home an hour away fine).
1994 Jeep YJ : 3.75" of lift, 4.56 gears, 8.8 w/ lsd, 34X10.5 TSLS and some other stuff. 4 Angry Squirrels and proud!
1981 (with some 80 and 84 parts thrown in) CJ7 under restoration. SBC 350, 2.5" lift, half hard top and lots of fun!