Just for clarification - Your using the "date" your using to compare these findings to the SA completion date not the Ford date.
If so it would seem that both the exceptions would fall into your pattern - post 4/27/67 dates (6/25/67 & 7/8/67 as you listed)
Believe this subject was discussed in SAAC forum 1.0 and I recall the possible application was to signify a car was completed, ready to ship so to speak, but may have not been done (opps missed some) to 100%
Will try and find some time to see if I have any prior to the SA completion date you posted
Game just starting:)