I have lost, I kid you not, FOUR garage door openers. I took it off the visor and from there it disappeared. I don't usually carry a purse, so there's little chance it made its way indoors. I grabbed the second one. Dissappeared. I replaced them. Again, the clicker was removed from the visor (lesson not learned), and it got lost. I didn't have time to search, so grabbed the spare. That got lost. I went to clean out the car and find them. I checked under the seats and in crevices...gone...four of them, FOUR!
Mom lost her bite plate when it fell out of their car in a parking lot (she found that out because they stopped at the same hamburger place on their way home & found it - it was repairable). I wonder if the garage door openers got kicked out of the car or took a dive out the door to explore the world?
The only thing I can think of is the clicker got removed when doing a quick clean and stuffing everything into a box or bucket to get to later, but when cleaning out the box, the clicker never turned up. It's a reasonable explanation for one, but FOUR? As far as I know, the clicker never left the car, it just evaporated. All four of them evaporated. I am usually very aware of things falling out, what with kids, a messy car, and losing things you put on top, you sort of learn to pay attention to these things
. Sure, it's possible they got lost in a parking lot somewhere, but I really don't think so. I remember it being on the passenger seat, and you hit the brakes a little hard and things slide off to the floor. Upon retreiving the items from the floor, the clicker is gone. Four times. Evaporated. 
At the moment, VorGuy has TWO similar cell phone cases for his belt/waistband. Only one of them can be found at any time. The clips on the back are different - so I know which one he is using (one is from eBay, the other is from Big Lots). I have a third, also from Big Lots. I suppose I should say that we can find only two out of three - because we both have one. He just can't figure out what happened to the third one, until it shows up on the dresser and one of the other two is now missing......which one?
And we have found the clicker for our garage door opener....which quit working (garage door opener - not the clicker).