Thank you for sharing your experience and results of inventorying this stamp collection.
I agree that most of it is generally unsorted within most of the albums that I looked at.
Sometimes these types of collections are labelled as an "accumulation",
since they are not organized in the more traditional way in printed albums with one rectangle for each known stamp.
Although Albums 5 and 10 (QE II) are such traditional albums,
and Album 4 was generally organized this way -
clearly with stamps bought from the post office and labelled with the dates of purchase.
I did find a few somewhat higher value US stamps in Album 14.
They are mostly from the 1893 Columbian Exposition set.
Page 2: 5c, 15c (also 1c, 2c) This page also has better than average older stamps in rows 2 and 3.
Page 11: 5c, 5c, 8c (and 2c)
Page 62: 5c (and 2c)
The 15c Columbian should probably sell for around $9 on
ebay if it doesn't have faults like tears, stains, missing perfs, thins on the back, etc.
I suppose that is not "substantial" in terms of the effort you've spent in getting photos,
but I wanted you to know these are well above average and not common like almost all of the other stamps.
You can look up "catalog values" on stampworld.com.
I've found that stamps tend to actually sell on
ebay for around 15% of these catalog values.
So for the 15c Columbian, it has catalog value $65.68 (in the "#" column for a used stamp),
and 15% of that is about $9.
I also collect coins, and a good online site for identifying and looking up values is numista.com , in case that helps.