I saw the post about her putting it in two envelopes, and agree she may have accidently might have mailed them. If she was paying bills try and figure out to whom she might have sent payments to.
Funny how folks lose money. Tuesday I was at the shop, was bored and was walking the aisles, facing the products. There, on an empty spot on one of the shelves sat a $5.00 bill. Who would take money out and stick it on a shelf and forget about it? Someone did, and as of today no one has come back or called about it. I know it's only $5.00, but what if they were doing it with larger denominations too?
And you'd be surprised where folks can hide money. My Gramps had thousands in coins, many of them silver dollars hidden away in jars of bolts/nuts/screws and such down in the workshop of the barn. I doubt we found half of what he might have stashed in places.