These stories are more about the imagination than about the fantastical. They consider that brief period of time when children believe that grown-ups can explain everything, and when taking advantage of that belief can be a good thing to do.
Of course, each of these LOST stories has a rational explanation.
Apart from, perhaps . . .
You see, when I was little I was always losing my things. Granny said I had to take more care. And I really tried. But somehow things just kept getting lost. My mittens, my slippers, my mobile phone, my car keys, my credit cards. But the one thing I never expected to lose, that nobody expected me to lose, was my TIME.