You could hire gig workers to place the dronepackages a "pr" gag allover town. There is not a need for flags, territory or other outdated concepts. Just attrition and correlation.. of wear and tear on civilization
Any conflict has reasons behind it, as it is just another enterprise that consumes resources for expected rewards. Given the practical needs to manage the said consumed resources, even in guerilla style warfare the conflicts have to have limits (i.e. be contained to a territory). The territory, which these conflicts are waged on, can be and is sooner or later linked to (at least suspected) interested parties. The flags are basically just means to identify a given interested party once it grows past the Dunbar’s number. I do not say that there aren't concepts out there that have little to no practical use (say, an anthem, or a motto), I'm just saying that your list outdated concepts were not good examples.
It will be interesting to see the police response to the next abusive cop put paid leave being killed or maimed by a drone released by vigilantes.
How about a scenario where police officers are sousveilled by large, anonymous groups to build datasets that can be used to apply pressure to law enforcement and their union groups when they attempt to take more power by demanding larger police budgets.