We have two walnut trees along the edge of our garden. They have been there for thirty years or more but they never do really well - perhaps their position is wrong, or we are too far North for them. At the most they have around fifty or sixty nuts on each year, and, although the farmer gathers them, we always find that the nuts inside shrivel before they are ripe enough to eat.
This year the farmer picked them all as usual, putting them into a wooden crate and carrying them into the big shed (this is the shed which houses much of our farm equipment over the winter). There were around a hundred walnuts. When he went into the shed the next morning the crate was empty. Something had taken the lot overnight.
Now I like to think that there are quite a few mice who have chosen to spend the cold winter in a state of semi hibernation in the shed and that during that one day they carried off the walnuts to stock up their winter larders.
I must say I do not begrudge them a single walnut - bon apetite mice wherever you have chosen to store them.