My father passed away in July, and he was a avid coin and stamp collector, but for the past decade he started just accumulating stamps in various forms. Our family has found all these coils and 25 sheets, plate blocks, singles, booklets, etc. See below.
Still in the original packaging (not recommended, I see)


I have found supplement sheets to place the singles, plate blocks, etc. But we have literally hundreds of what you see in this picture.
My question is about the coils and strips of 25.
How do I archive these? Why did my dad buy 4 of some, 3 of the other, etc.? Only from a collector's point of view, obviously. Trade?
We are not looking to sell, but to actually make it a collection from where he ended (around 1985!)
Any thoughts would help; I am seeking out a local stamp club, too.
mintSheet