My gran and grandad had very little trust of anything or anyone, including financial establishments, which is odd as he was an insurance person for one of the big companies at the time. I think it was life insurance.
We found his war medals were through the gap in the floorboards under the kitchen sink where the waste pipe went through the floor and pushed along a bit. Apparently he did mention that once which is why my mam looked. I did some redecorating work for them and found a bag of cash behind a wardrobe when I move it. I think there might have been something else under a floorboard too when they cleared the house.
Nothing had been done to the house for decades, so the person who bought it did a full refurb. It would not surprise me if one or two of the builders had a very lucky day.