All the stuff left behind in the bunker?
Hitlers clothes? Pistols that he used to kill himself. His Nazi button? His maps, all of this stuff must have collectors value.
Where did it all end up?
Eva's stuff?
I think I read where parts of the bunker still exists.
The Soviets got there first, so a lot of that stuff was probably taken by soldiers as souvenirs. I don't know about Hitler's pistol. The Russians may have it in their archives. It may have been taken by a German officer in the bunker and later upon their capture taken as just another Walther PPK of no significance. Hitler gave his party badge to Magda Goebbels, and it later was stolen from a Russian museum in 2005.
What remains of the bunker is just ruins; it was stripped bare and a lot of it ended up flooded. Whatever left is likely just an empty shell.