Who seen this car around the school the night of September 9th, 1977?

Sure it was the vehicle Archibeque was driving at that time but it needs to be linked to Mary such as being seen in the area of the party / highschool that night or someone might have seen Mary in this car.

The investigators need your help. Don't be afraid to stand up and come forward. Mary, the Angel she is, will protect you. Do the right thing. Get involved!

It will not become evidence unless someone comes forward.