Think your Post is one package to late

If you had a queen (and you did) they more than likely did fight
I hope bot lived, If one did your still good
If your Lucky both are there go looking catch the first you find
Put her and some bees in another Hive and keep her caged for a few days
watch the other hive see how they act and if there is a growing number
of eggs?
If you see eggs you have 2 queen right hives. I'm new also but I know never put a
queen into a colony that has a queen already,unless your into queen fighting
maybe there is something too it like bleep Fighting

The reason IMHO you saw only some larva is its early up there or you did in fact have a
poor queen?? I would think as far up north as you are she was just getting
started ,Keep in mind I am in the learning curve too
Good luck hope some of the real Beeks post up
Tommyt