[69 camper custom]

I am having a hard time finding out production numbers of a 1969 GMC camper custom. Is it true, were all documents burnt in a fire?? Could someone please just give me an idea of what the production numbers might be? 1969 GMC camper custom 1 ton 396 big block, 4 speed, A/C, full gauges with fuel economy gauge, dual saddle tanks, rear air bags. Any info would be greatly appreciated.
Thanks
69 Camper Custom