This is my nagging thought, it must happen quite a bit, where money just gets lost, because the records are old and nobody (my parents) told me about "things". So it was a hunt, and I'll basically never know if I missed something.
Sort of related just about 4 years ago, in our 100 yr old family cabin, I wanted to hide something so it would not be stolen when people broke in (which happens now and then).
So I found a good spot, and when I opened it up to put in my stuff, I found a TREASURE that I can only surmise Grandfather had hidden there. Obviously due to the nature of the TREASURE, my Parents never knew it was there, or they would have not left it there.
Now of course I'm wondering about other spots around the cabin, and previous homes Grandfather lived in.