This movie was about a young man and his friend trying to find the original u.s. flag by betsy ross, filmed in modern times, but this female secret agent was one step ahead of them and at the end she retrieves the flag from a crypt and is shown later presenting it to the board members of this secret organization.
when did you see it? was it a kids movie?
I don’t know if this is it, but I recall something about the flag, but mostly about the constitution. It’s a comedy from early 90’s. Spirit of '76 The Spirit of '76 (1990) - IMDb