The Mystery of the Missing Lid

There were three...

I seem to be missing a pot lid....and I am truly baffled.  I have only one cupboard with only two shelves where I keep the pots and pans--and their respective lids.  

I have only three pots and each had a lid.  The pots were stored side by side, each one with its lid on.  Now one of the pots is bare-headed and I am at a complete loss as to explain where its lid could possibly be.  I have completely emptied both shelves--no lid.  I have looked in the oven, in the fridge, in the freezer, in the cupboards where I store my food, on the shelves where I keep my few dishes.  No lid.

It's not in the dishwasher; I don't have a dishwasher.  I have even gone so far as to look in my nightstand.  I have been known to carry something with me, get distracted or overtaken my by house-keeping ADD and leave items lying in places that they don't belong.  I am fairly certain that I did NOT put it in the trash accidentally, which I have been known to do to flatware--even sterling silver--because my trash bags aren't that big.  I would have noticed if I had put a pot lid in with the butcher paper. 

It has to be somewhere.  I am going to try to remain calm about it.  I suspect that one day, I may run across it while looking for a piece of sheet music or a winter scarf.  I did, after all, just get my walk-in closet organized.  In the meantime, its whereabouts remain a mysterious nuisance.