About ten years ago I was staying at a friend's apartment in Paris. My room was also the library, so all the walls were lined floor to ceiling with hundreds and hundreds of books. As usual back then I had several grams of coke with me, and I thought I should keep one gram "just for me". So I hid a gram in one of the books on the shelves, memorized the title and went out with my friends.
When we got back to the apartment I told my friend I was going to bed, intending to have my own private party. Pulled the book off the self and the coke wasn't in it. Tried the several books on the shelf next to it, and no coke. I started getting frantic, totally lost all faith in my ability to remember the name of a book for 3 hours, and started pulling all the books off the shelves and shaking them out looking for the coke, then piling them up on the floor. This must have made some noise, and my friend looked in to see what I was up to, found me knee deep in his books. (I told him I had stuck my passport and money somewhere among the books and couldn't find them).
Never found the coke.
Another lost drug story:
Four and a half years ago I checked into detox and then rehab to deal with a very large heroin habit. The counselors advised that we be honest about our drug hiding places back home, and make sure someone cleans them out before we get back. I had one of my heroin friends scoop out the remaining dope in my dresser drawer, and thought I was returning from rehab to a drug free household.
Over the next month, just in the course of regular daily stuff, I found in my apartment two grams of coke, a full bottle of Vicodin, some weed, 4 hits of E, several valiums and some codeine pills. And I was TOTALLY UNAWARE OF HAVING LOST ANY OF IT IN THE FIRST PLACE!