That's some old stuff.
The only thing that a$$hole FIL of mine will ever leave me, will be the funeral bill.
Ernie sounds like a very special person. Of course he was part of the Greatest Generation, so that's not a surprise. I envy you knowing him. I'd just keep the ammo for sentimental value. Just my $.02.
I shot a few old ones a few years ago. You might want to use a rag to get the powder oxidation off the lead though.
Ditto on the boxes. You gotta keep them. I collect those, and the Rem boxes are 40+ years old.