I'm so glad I'm not the only one who does that! Once I hid a Christmas gift ( a Santa gift) and I've never found it!! That was 40 years ago!! And yes, I do clean more often than that.LOL Only thing I can figure is it fell between the walls in the basement.Nope, couldn't be there, we just remodeled there and went to the studs. Maybe it fell in those holes that are in concrete blocks( outside walls???)