The Tak-A 28-80 is considered a doorstop by most. It isn't That terrible of a lens however. It was one of my first and When I sold it, it went for $60 (on ebay) and it wasn't anywhere near that condition. I suspect that same lens has seen a few new owners since then. That's Still about the price, some more, some less. Yours however appears to be in mint condition as if it were never used (perhaps with good reason). I don't know anything about the other two lenses.
The brochures and magazines. Many, like your father, are collectors of this sort of stuff. Were this My stuff, and I was looking to move it along, I would list it on ebay for about $1 each and see where they go. Just don't try and charge $5 shipping for each.
The Bellows.. don't know. Looks like one of their original ones and the fact that it appears complete and given it's condition could bring a few extra $$ as well.
The hard spotmatic case, I wouldn't be shocked to see it fetch $15-$20. The meters, same thing (for the lot of them). The flash bulbs, it may seem surprising but there are still people who use them. Especially the Press 25s as those are the types that work best in the old Speed Graphic flashes. One might be shocked nowadays at how well one of those will light up a room. Just keep the nose plug on because the burning lacquer smell is obnoxious.