I find things like Marion's charm work well for me for mundane stuff, but not so well for anything significant. My house is somewhat untidy, but reasonably organised (at least by my lights), and I'm one of those people who generally knows where among my archeological layers a given thing is, though it drives those round me crazy.
I do occasionally lose stones or working (with a capital W) tools, and I think they go for reasons of their own. They usually come back into my life at a more or less significant moment, either coincident with an event or happening, or as an indicator that it is time to work with that object. Some things, of course, I lose because I neglect them; if you don't pay attention to a charged object, why would it not walk?
Last year, though, I lost a pendant... I do often wear, under my clothes, a small pentacle, one of those nice ones with the flower-petal interlace. And it disappeared. I searched everywhere for it -- everywhere. Then a dear friend of ours died, and as I was getting dressed for his wake, the pentacle fell out of a little bag I use to carry around bits and pieces of "special" jewellery. Now, I KNOW I'd turned out and emptied that bag several times since losing the pentacle, yet there it was; somehow, I needed to wear it to mark D's passing. And since then it's stayed.
I'll look for lost ritual objects, and if I have something special in mind that I really, really need some AWOL thing for, I'll tell it so, aloud, in the hopes of drawing it back... which sometimes works... but I've come to accept that a lot of them do come into and out of my world according to their own whims.