These are from the post-WW1 hyperinflation period of Germany. There were a lot of remainders of most of the stamps of that period. In my old 2007 Scott catalog, these particular stamps have a "catalog value" of 20 cents each. Actual monetary value is almost nothing.
The 50 Mark should be a Michel #209 / Scott #184 (1922). The 4 (Michel #316) & 5 Million (Michel #317) are from 1923. And the overprint is from 1923 as well -> Michel #303. Maybe someone could help you with the missing scott numbers.
But I would never say, that they are not worth anything ... they can be found in so many varieties - e.g. the rosette in the 4 and 5 Million exists in 22 different types, the "800 Tausend" overprint could have 20 or 21 bars, the "8" can be damaged slightly or the old German "s" is different.
Superficially, they appear to be common stamps. As tommtomm notes, there are occasionally uncommon or even rare stamps that hide in plain sight because of small differences that go unnoticed by most collectors.
Unless someone is willing to put in the time to learn about the variations (and invest the money to buy lots of reference material), those varieties just keep circulating around until they get recognized, if they ever do.
So, it is safe to say that they appear to be common, though it is possible that one or another of them is not common.
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