That idiot Hitler even got the details of what would happen to his body after the war wrong. He assumed the Russians would display it like a trophy. In reality the alies would have cremated the body and dumped the ash in the river to make sure his where he was buried did not become a place of pilgrimage by Germans under occupation.
The bodies were dug up again and this last time they only found this piece of skull with a hole in it. So they made a trophy of it but they themselves were not sure if it was Hitler. They do have Hitler's couch he committed suicide on with the blood stains but that is also in pieces.
To answer Hodar's question - the reason it was not easily identifiable was that the Nazis burned the bodies with gasoline in a bomb crater that could have been hit again and scattering the parts here and there.
According to a translated interview with one of the surviving Red Army guys, Eva Braun’s body was in adequate shape to do an autopsy, and she was pregnant when she died. As you said, the preference was cremation, but the RA added that they didn’t have a crematorium (ironic, in the ruins of the Third Reich) so the remains were buried after identity was verified. Later they were exhumed (how much later he didn’t say, but it must have been the better part of a year) because Stalin wanted to see proof. The USSR had claimed that Hitler had been given sanctuary in the west. Also there was a phony diary which claimed that Hitler had tried to escape via U-Boat, which was detected and sunk in the Baltic, or in the North Sea (I forget).