Sigh. I come across one of these little presents from Amelie a couple of times a week, in various places in the house. Putting them under a cushion on the sofa seems to be a favourite trick - that way you get an unpleasant suprise when you try and lie down to watch some TV. When we have visitors coming we have to do a spot-check of all our soft furnishings for wayward rotten fruit (though that won't always do the trick: the one she hid behind the sink pedestal in the bathroom took ages to find, and had changed color quite substantially by the time it was located)...
She seems quite methodical about it; the bites are all evenly spaced, but it's clear she doesn't like to actually take two adjacent mouthfuls from the same piece of fruit.
If you wanted to give her an apple to count towards her 'five a day', you would actually have to give her bagful, and then she's eat 10-20% of each one, before hiding them like a squirrel to come back to later....