It doesn't sound right away to me:

>The brothers found six comic books, including Superman #1, in the loft underneath a stack of newspapers inside a cardboard box and surrounded by cobwebs in 2024, Heritage said.

> They waited a few months before contacting the auction house, but once they did, Heritage Auctions vice-president Lon Allen visited them in San Francisco within days, according to the auction house.

>The brothers, who have chosen to withhold their names, are "in their 50s and 60s, and their mom had always told them she had an expensive comics collection but never showed them", Mr Allen said.

Yep, it's not right away. They hesitated a few months to get rid of the 80-year old family piece, which their mother didn't bother selling. Family possessions should be treated as reserves to help off-springs down the family hierarchy in the needy times. Not to cash out because they are in 50s and 60s. 50s and 60s are just middle age when some people do a fresh start of their lives.