If you are like me, you will be interested to hear
from a friend of mine who sold the contents of his mother's house. The
1980s version of the Encyclopedia Britannica was worth $0. Leaving it
out on the street...it took days to disappear.
What was of some value were womens clothing from the 40s, 50s and 60s.
The surprise value was the old unopened fishing lures.
Coins and stamps were of little value because there are so many stamp and coin collectors and they have been collecting for so long.
What will be valuable in forty years? It won't be something rational people think of collecting.