Just contact the nearest relevant museum to you. In London the Imperial War Museum deals with such potential bequests; they don’t take everything they’re offered, but they direct you towards museums that might. I assume there’s some similar museum a lot closer to you than London is, but if all else fails you could contact them.
Selling would be a bad idea - the thought of some Nazi using them to promote Nazism would be horrific.
Or just keep them. They’re a part of your family’s history. Nobody’s going to think you’re a secret Nazi because you have them - you have them because your Jewish Dad was a little kid in Berlin during one of the most significant Olympics ever.
Some people out there deny the Holocaust. Destroying any proof thereof would be a mistake IMO. If you don’t feel comfortable holding on to them or selling them, find a reputable museum and donate them.
Football Hall of Famer and Minnesota Supreme Court Justice Alan Page collects such things. His foundation might be able to put you in touch with an appropriate dealer - since getting that sort of thing in the hands of someone appropriate is the challenge. (His collection was on display when the Super Bowl was in town)…https://www.page-ed.org/ Also contact the Smithsonian African American History museum, they may want them or know someone who does. Their collection is mostly relatively recent donations. There is also an African American History museum being established down South somewhere.
In the U.S. that’s probably the United States Holocaust museum or the National Museum of Jewish American History in Philadelphia. Also Clark University has the U.S.'s only program in Genocide Studies and contacting them could put it in the hands of a responsible museum or scholar. (Many of the Holocaust museum’s staff comes out of Clark’s program).
I mean, do the museums really need one more nazi-Olympics brochure? If you really don’t want it just rip it up and throw it in the trash. I can’t imagine jumping through a bunch of hoops to make sure it’s saved for posterity.
There are people in the world, right now, who will tell you that the Holocaust never happened. It is to laugh, you might say, because there’s so much evidence. So many witnesses. So much primary source documentation.
What about a hundred years from now? Two hundred?
There are a thousand thousand atrocities that we’ve forgotten about and will never be remembered. There are a thousand thousand more that have been relegated to historical tidbits. Jews have been on the receiving end of more than our fair share.
We say “never forget” because we know that history always forgets, eventually, unless you help it out.