More can always be said on the matter if anyone would like to contribute, so if you want to write up your own post, please don't let this linkdrop stop you! For the meantime, OP, this previous thread on the restitution of German Jews may be interesting. u/Cyberpunkapostle covers the recovery of property, while u/gingeryid looks at reuniting with family.

Look into Some Measure of Justice: The Holocaust Era Restitution Campaign of the 1990s by Michael Marrus. It was one of the texts in my Holocaust course in grad school. Essentially, a small few of those who survived were able to get SOME of their assets back. The book argues that the U.S. legal system was the best, if not the only, legal system able to administer justice (“justice”) to individuals half a world away and half a century later. Things like paintings found themselves in museums and personal collections—it’s remarkable and heartbreaking to hear what survivors and their families had to go through. It’s a pretty good start, at the least. Hopefully this helps!