How Common are 67 GTX and RT Buildsheets?

Seems like there are always plenty or original cars out there for sale 68-70 that have their buildsheets. I rarely see 67 cars with them, is there a reason for this? Like in 67 most sheets never made it to the cars or is it just coincidental. Thanks.

I think it is coincidental. I found three sheets in a '67 belv. II 4 dr., 1 sheet in a '67 coronet 440, the remnants of a sheet in a '67 belv. II vert.

my 67 RT had a buildsheet, until I lost it.

I've got seven '67 Plymouth 'B' bodies and three of them had Production Broadcast sheets.

My 67 Barracuda had zip. All original and untouched till I got a hold of it. I was shocked not to find anything. Not even loose change under the carpet.

My 67 R/T had a good build sheet, behind the seat, for another car ( about 150 cars off).. I found the remains of a build sheet under the door sill, that is/was unreadable...

I have a sheet for my 67 R/T. Found three in a '67 GTX once, one for the car, one for a hemi car and one for another 440 car. Have had three other R/T's with them, had a couple 67 GTX's that didn't too. I have a friend with an original '67 GTX convertible. We pulled out the back seat and found two, one for his car and one for another GTX convert! It's hit and miss just like every other Mopar.

Just as common as they are in any other 66-71 Mopar