When our son lived at home, he could never find his picks: I found them all over tge house and still have some of them. Always keep one in the outside pocket of my money purse.

The other answer is, check your keyboard gig bag, if you have one. Surprised to find one in mine after a famous person asked to borrow my keyboard for a gig at our local folk club. (He also played guitar). Fortunately the pick did not slide between the keys!