A few years back I purchased an estate sale home complete with contents.
The prior owner had passed and the house was vacant for almost a year. When I took over the place was the exact same as he left it (found out he passed in the hospital). Clothes were still in dressers/closet, food in the fridge/cupboards, etc. It was somewhat a bit of a hoard as the entire main floor had not been lived in for at least a couple of decades.
Most of the stuff was not worth anything and it was tossed it in to the dumpster.
I did find about $3,000 in cash and gold coins, stamp collection (which I have not had appraised), kept some of the wooden bedroom furniture as it was solid maple and only needed a good cleaning and painting, and about $1,000 worth of tools. To buy the bedroom furniture of that quality would have easily cost $3,000 or more so in all I discovered/saved around $7,000. The cash was found in the strangest places, behind the dresser, boxes in food cupboards, in books, etc. so I took my time going through things before throwing them out.
I did find a couple of safety deposit keys with instructions on the bank and box number, however I have no idea if they are valid or how I would even confirm such.
As luck would have it I purchased it before the current house boom and the majority of the building supplies were bought before the Covid lumber increase.
I may sell it in the spring if I can find another fixer upper (in this case an internal gutting) as I enjoyed bringing this old house back to life and working on it was an enjoyable hobby.
In today's market I stand to clear 4 -5 times my original investment.