I noticed this as well! And I agree it's a bit frustrating not being able to see who sent them. However, I'm going on the assumption that any neighbour,who is able to, is sending them (if they've got...
Also, I know of some people who start their visits at a different letter of the alphabet each day. Others split up their visits into two parts so they don't have to do so many at once. I just go through the whole list in one go - it takes a while, but I prefer visiting everyone all in one go.
EDIT: spelling.
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