Yes, I have voles too. I realised that something was eating the swiss chard. When I lifted some nearby cardboard that was used as coverage, I saw that a little 'larder' was under there! Including bits of chard that had obviously been pulled off the plant! It's the resident vole obviously, from the presence of tunnels. SO yes they do move things around to eat later! But generally voles get a lot of their food from the compost piles as they hate being exposed in the open, so they don't really steal much. Their tunnels tend to be destructive though. and if they stumble on a spud in the ground they will eat it through!