@bibbitybobbityyhat - In my world, favours don't have to be 'tit for tat'. There are times of your life when you can help someone, who may never be able to help you. There will be other times in your life when someone helps you, that you can never 'pay back' directly. I'm amazed on MN when people won't do things to help others because the other person isn't in a position to help them in some equal way. That isn't how life works. I've done stuff for other people all my life, not because I am particularly kind, but because that is what I think is just 'normal'. I've also been lucky enough to have people do kind things for me. In terms of looking after my dc, when their dc are grown and I'll never be able to do the same for them, but years later, I've looked after other people's dc, because, at that stage in my life I could and someone else needed a bit of support. Same with lifts. Same with material things - I've been in the postition of having an empty flat and being grateful for all the things I was given, and I've been in the position of being able to pass on furniture and all sorts of other things that I no longer needed, to other people.
So yes, I see that someone working long hours might not, at this stage, be able to reciprocate re taking parcels in, but, probably now and in the future, I bet there will be things they can do for other people who can't 'pay them back'. That is how kindliness and neighbourliness works in my world.
I don't agree that it's normal neighbourly relations to expect your neighbours to answer the door to and store a lot of parcels for you (more than 1 or 2 a month) say?
Well, we'll have to agree to disagree then. As I said, I am now in a job where I work at home for at least part of the week. I would have no issue whatsoever with taking in parcels 2 - 3 times a week, let alone a month 
. In fact, last week, I took in 3 parcels in a day. That was unusual, but hardly ruined my day.