And not to know what to do?
A couple of weeks ago the police came to our house for the second time. I live in converted flats which have a communal hall between the two of us.
Neighbour was not in trouble, it was a welfare check by a member of staff at someone they regularly go. This has happened before and neighbour was with family. The police asked me to contact them as soon as I saw neighbour.
So I still have not 'seen' neighbour. Usually because of design of the flats I hear them come in however they must have been intentionally coming in very quietly so I do not hear. There is no answer when I have knocked.
We also put post behind the door as letter box is communal and theirs is in a big pile including a letter which is from a family member (it says on the outside of the envelope)
Neighbour is definitely coming in and out as what they have not figured is that as I come up the stairs you can tell if the key is in the lock or not (light shines through if its not)