it happens all the time. I have two cars missing both, but the door tag is at least on them. friend bought a 71' CUDA from a divorce lady that her husband removed the tags knowing she couldn't sell them for much after the separation. Most common remedy is the find the body number and confirm it's not stolen. once that is done, get a state issued title for it and get the Highway Patrol to add a vin tag to the car. Not that hard and reasonably affordable. This car could make a good hotrod/drag car with a little work.