There were actually brush fire conflicts all over the place during the Cold War, few rated a mention unless one of the primary antagonists was involved somehow.
Which is the tricky part in developing "Brush Wars"-level material for BT. Some eras had a few legitimately interesting, extended campaigns, like the ones we detailed in the original "Brush Wars" and "Wars of the Republic Era." But basically every era also has an overarching caveat of "...but there was also consistent, low-level raiding"--which isn't intended as unpaved road for a future sourcebook, but as basis for players' Saturday afternoon game if they're interested in attaching it to canon.
So where do you draw the line between "significant enough for sourcebook treatment" and "it's just there to give players a hook for their game." It's not an easy question, especially since many (but not all, I know) of the historical gaps have already been caulked in.
But we're getting off topic. Those 3250 mentions in recent sourcebooks
are canon, and
are meant as unpaved road for possible future development.