A year or two ago, I lost my house keys. I always put them in a specific pocket in my purse with my car keys (they are separate).
I pulled everything out of my purse, no keys. I also have a canvas bag which I carry my purse in along with a book, an agenda book, my reading glasses and anything else that I pick up and throw in. So I dumped it on the the floor, no keys.
Of course I realized I'd lost them a day or two after I could remember using them. My neighbours have my extra set, so I used them.
After a week of looking, I'd come to the conclusion that I was going to have to get all of my keys recut. Just as I was going out have this done, I looked in my purse. And there were the keys! I have no idea why I didn't find them earlier. My purse is not big as I hate those huge purses that have no pockets and everything ends up somewhere on the bottom.
I always put my keys in a specific pocket and occasionally I miss the pocket and they fall into another area of my purse. But I keep my purse relatively empty with only keys, wallet and possibly a receipt or two, and my cheque book, so where were they for the entire week?