I stumbled across the page „EphemeraSearch“ (https://www.ephemerasearch.com/), which allows to import images from ebay auctions, and add metadata to these imports.
I’ve started collecting some documents under https://www.ephemerasearch.com/tags/11397/ and https://www.ephemerasearch.com/tags/11398/, and will try to expand this collection.
Could be interesting as some personal documents survived in this form, and even some documents from the organization side.
Sadly, most of the dp correspondence is not available, only the envelopes can be found (still with names, but the personal stories would be interesting).