Where would I find a build sheet on a 69 chevelle?

Thanks Tony

Since build sheets were never intended to stay with the car, You may not find one. But on 69's they have been found
In the springs under the back seat
in the springs under front bucket seats
stuck to the inside of the door panels
stuffed above the head liner
under the carpet (pass. side near the front of the trans tunnel)
between the inner and outer front fenders
on top of the gas tank..

Thanks for quick response

Tony