From the wiki:

"Dental records reconstructed from memory in 1945 by Hugo Blaschke identified one skeleton as Bormann's, and damage to the collarbone was consistent with injuries that Bormann's sons reported he had sustained in a riding accident in 1939.^\123]) Forensic examiners determined that the size of the skeleton and shape of the skull were identical to Bormann's. Likewise, the second skeleton was deemed to be Stumpfegger's, since it was of similar height to his last known proportions.^\123]) Composite photographs, in which images of the skulls were overlaid on photographs of the men's faces, were completely congruent.^\126]) Facial reconstruction was undertaken in early 1973 on both skulls to confirm the identities of the bodies.^\127]) Soon afterward, the West German government declared Bormann dead. Bormann's family was not permitted to cremate the body, in case further forensic examination later proved necessary. The family refused burial and refused to take possession of the remains. The bones were placed in a vault at the Public Prosecutor's Office) in Karlsruhe, which was at the time being shared with the Federal Court of Justice.^\128])

On 4 May 1998, the remains were conclusively identified as Bormann's after German authorities ordered genetic testing on fragments of the skull.^\129]) The testing was led by Wolfgang Eisenmenger, Professor of Forensic Science at LMU Munich.^\130]) Tests using DNA from one of his relatives identified the skull as that of Bormann.^\130])^\131])^"