bastereo,
I also sympathize with you and your husband's condition.
Hopefully your husband kept original manuals, that might be an easier way to get a list together, then do a visual matchup of what still exists, (some manuals could be for sold/traded/discarded items). Original manuals will help sales.
Original boxes? Even if local pickup, they can help maintain value and increase the number of potential buyers.
A local young person to do the heavy lifting?
I've sold and bought on Facebook Messenger, Craigslist, eBay, US Audio Mart, Canuck Audio Mart, they are all good in their own way, use common sense regarding safety, and avoiding wasting your time.
Bulk List, no photos: Messenger and regional Craigslist is probably going to be your easiest method for a bulk 'all gone' local pickup solution.
best of luck dealing with this,
Elliott