You've got a really good friend there! I'd like to have gifts like that.... Get the vets name if you can, and if he's still living and can remember, any details about where he got them. Stories add a lot to the piece.
That SA badge by that maker in silver (plate) retails for around 200$ (could go a bit higher even) The "Tag Der Arbeit" (Day of Work) tinnie is a nice one, but tinnies with a few exceptions don't command high prices, maybe 20-30$? The flag pin is from the Kriegsmarine (navy) I've seen similar ones in the 40-50$ range. The oval pin "Befreiungs Gaufest DRL 1935 Saarbrücken" Commemorates the Saarland voting to rejoin Germany, it's a nice one and should bring 40-50$ as well
The eagle and crown I don't immediately recognize, but it looks vaguely Prussian to me.(could be Polish? any markings on the back?) No clue on the star either. The Ruptured Duck sadly is so common I remember them in a box on the counter of the army navy store when I was a kid for 50 cents a piece.
Side note: On German military badges and medals, the maker is VERY important. An Iron Cross from a desirable (rare) maker can bring considerably more than the exact same cross by a different maker. Even though they are pretty much identical medals. If you come across anything Third Reich, when you're looking for values make sure you research the item and the maker as well, you might be surprised by the wide ranges in value
