One example is "A Crossroad Hamlet Assault", which I downloaded from the repository section for CMSF base game. Another is "One Night in Waziristan". Neither of them show up under "battles" when the game is run.
Turns out the campaign was for CMSF:Marines, so my bad on that one. I did however just grab a 3rd scenario from the CMSF base game repository (Choke Point), and that one works. So perhaps the first two were erroneously put in the base game section.