I can't find my sandpaper letters! :(

I have been wanting to get my littler niece going on the sandpaper letters and to continue working on the cursive with my 6yo niece (her print is just beautiful--I'd like to take credit for having worked with her a bit before she went to kindergarten, but I don't know if I have anything to do with it!). I can not find them. They're not in the shelves and as far as I can tell, they're not in the storage unit nor in my den closet. I can not for the life of me think where I would have put them. :(((((