I had heard that the people native to the locations are being buried in large pits, but that the bodies of the Europeans and other foreigners are being held so that they can be identified by their family members. The authorities were taking pictures of all the dead and recording any physical characteristics; clothing, tatoos, distinguishing marks, etc to help in the identification. The biggest problem, especially with the native peoples is that likely whole families were wiped out, and there is no one left to identify and claim the bodies.
If they can get enough DNA samples per person, mark it and store it properly, the DNA will keep indefinitely.
Hopefully there will be a way to identify most everyone, and with DNA samples and technology perhaps all in the near future.