Now were getting somewhere!
The second link is to a set of 1936 summer Olympics (Issued May 8, 1936) on a flown Zeppelin cover. This, by far and away, is your best item.
It's difficult to put a value on this cover. Scott catalogue values the individual stamps at $15.75, and Michel (German specialized catalogue) values the 40pf stamp on cover at 22€. My opinion is that this cover should be sold separate from the rest of the collection and it should sell in the $50-$75 range.

There is a used 1949 Berlin set pictured (catalogue 9N42-9N60) that catalogues for $45. These sets typically sell for $10-$15.
The last two links (in the last two posts made by you) feature German 3rd Reich era stamps. The value of those are dependant on the status of the gum. If Never Hinged, unblemished gum, the single stamp (Scott catalogue B169) is valued at $6 unused/hinged gum or $27.50 if Never Hinged. The last photo is Scott catalogue B177-185. If Never Hinged, the set is valued at $32.
With German stamps, the condition of the gum has a HUGE impact on value. You're going to need to check the backs of your unused stamps.
Cheers
Brian