I think they came from either the original Pacific or Guadalcana
They are from the Original Pacific game. There were six in the box, you got the plastic piece for the board numbered 1 to 6, with a spot to place your roundel, and a cardboard stock card to place your units on, off board. This is also the same game where naval and airbase were iplemented for the first time (albiet slightly different)
Revised also came with Cardboard Army roundels and Cards numbered 1 - 10 to place large clusters of ground units on the board. This worked quite well as well.
What failed miserably however, was the advent of movement counters that were supposed to follow your aircraft pieces. What a waste of time and resources. In 500 games I’ve never seen them used.