Not sure what model drone you have but I’d say flight logs get written over if they are not cleared fairly soon.
Personally, I’d make a friendly gesture by inviting the neighbor over for dessert or something and show your neighbor how to scan...
I don't believe you can. Once you create a custom unlock, you cannot fly outside of it, once inside of it. The rest of the world outside the custom unlock becomes an NFZ. That's why custom unlocks should be avoided wherever possible.
However...
I didn't but clearly SHOULD have known this. Good news is I flew quite a lot in beautiful Maine. All three batteries charged well and I did not have any issues other than having to update the firmware for the drone and I think the controller.