I just found a build sheet stuffed between the right front fender and the cowl . Right behind the GS emblem on the fender. KC plant June 1970 built. 4 found so far ..
4 on one car and some of us can't find a single. Not fair! That is one fine time capsule you purchased.
I found two in my '68 Wilmington built GS, there may be more but I have not stumbled across them yet. This seems to be common in Wilmington cars also.