are established internal territories considered fair game for future packs?

title is fairly self-explanatory, but to elaborate:

say someone wants to make a new pack in blackfeather woods or northstar vale, territories that have seen quite a bit of use by previous packs -- what is expected from the new pack regarding the original/old pack's internal territories? it's been established that new packs have the freedom to add new internal territories, but as far as i know there's no official protocol for those who prefer the path of keeping continuity (aka re-using internal territories). it's usually polite to ask permission from creators to use their creations, but what if the creator of a former pack's internal territories is no longer on wolf or able to be contacted, or if the creator is unclear/multiple people?

basically what i'm asking is whether internal territories that have been established and referenced in-game are considered the property of the original creator/pack in the territory (and therefore unavailable for reference/use without permission), or if they're seen as belonging to the community? specific names and written descriptions not included; only the landmarks themselves.