Mice strike back in unusual place

How about this for a weird event.

I went to top up the screen wash today, in the car that we used to go up to the boat the other week. There is a cup like indent above the shock absorber struts on each side and in one of them were about 30 red berries. They could not have been blown or washed in by wind or rain as there is a bulk head in the way. They are not berries from home, they are like the ones near the car park at the marina. They must have been put there by somebody or something- its about 2ft above ground level and you couldn't reach it with your hand. It must be a winter stock of food for MICE- aaaaaaaaaaaaaaaaaaaaaaaah.