Thanks. I do have that one. It’s not the one i am looking for in particular. Their was a saved twitter thread if i remember correctly talking about the Soviets when they took over the camps they stole and hid documents and in particular the death numbers the Germans stored, specifically 169k recorded deaths
https://archive.org/details/ReportOfTheInternationalCommitteeOfTheRedCrossOnItsActivitiesDuring/ReportOfTheInternationalCommitteeOfTheRedCrossOnItsActivitiesDuringTheSecondWorldWarseptember11939-June301947Vol1/
There are a total of three volumes, so be sure to download all of them.