That's about all I can think of. I used to keep them because I was sure I could find a use but after years of stacking them up I decided I'd never find a use for them and I pitched them all.
I do keep my cardboard sleeves though. I tear them open and write down the load on them then toss them into the ammo can with the ammo I just loaded.
I also keep them as a way of keeping round-count on my presses. Each flap from a box of 1k is 1k rounds loaded on my press. Not that it really matters, but it's just interesting to looks back and know that over the last 15 years I've loaded over 20k rounds of shotshells and over 10k rounds of centerfire rifle ammo on my presses.