Nice to hear I'm not the only one who enjoys Heinichen's music!
There is a recording of several of his Italian cantatas made by the Batzdorfer Hofkapelle. It is a very nice recording, especially countertenor Terry Wey excels.
I wasn't very familiar with the Archiv recording of the Lamentationes, so thank you for your recommendation!
It is a beautiful recording and it is fascinating to observe the differences and similarities between Zelenka's and Heinichen's settings of texts from the lamentations.
Earlier, I thought the reason his other masses were not recorded had to do with the fact that the scores might have been damaged. But that's not the case for the most like for example his Missa 8 (May 1725): https://imslp.org/wiki/Missa_i…einichen%2C_Johann_David)
However, some scores are in much worser shape as this project by the SLUB shows: https://www.slub-dresden.de/mi…ft/johann-david-heinichen
There is also a Serenata (or Musica da tavola) for the name day of August the Strong from 1727 in the archives that seems really interesting.
It just feels almost absurd that there are such richly orchestrated baroque works in the archives without ever having been heard by modern ears.