If the property was in a remote area away from any neighbors it is/was possible he may of had a trap door in the floor or concealed wall his house and had it /hidden/buried. Especially if it was pier and beam foundation which most old houses are built on. Definitely have privacy in hiding your stash without someone lurking in the woods or across a field watching where you are going.
My mothers father he hid all his money under a trash bag between the trash bag and garbage can. My mother and aunt asked him, (when he took the trash out of the can and gave them each a $100), she asked him what in the heck was he doing hiding his money in the trash can. His response; "Who looks in the trash can to find money, especially if my house gets broken into?" When I heard him say that, I was only 12 years old at the time and it made sense to me but not my mother and aunt!
Older people that grew up even before and during the depression era always had ways of hiding things in places nobody would ever think of. You have to put your mind and think outside the box. Could be someone already found it and didn't say anything especially if maybe he hid it under his flooring under his house and it was bulldozed. But, I would get a detector, grid off the area like others have said, DIG EVERYTHING! You might even find stuff that may be junk, (or junk to you), that may be worth something even old bottles are worth some money to collectors. Finding treasure isn't easy, if it was we all would have found it all. Keep searching and good luck.
