This may be perceived as a bit of a ghoulish question, and I apologize if it offends anyone, as that is not my intention.
I remember reading somewhere, and I know I've seen a website on this subject, that artefacts and remains are frequently found in the Alps which date from the battles fought there during WW1. Apparently glaciers melt and reveal the remains, rather like Oetzi the Iceman.
Presumably everything is very well preserved by the ice. While the human remains are no doubt buried with full honours, what happens to the personal effects? Are they interred as a whole or do they go to some museum for archiving. It would seem to be a perfect opportunity to study primary evidence in situ. And as an extention of this question, are all war dead interred with the associated items they are found with?
Thank you for helping an inquiring mind.

Matthew