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I could've done it in like 10mins. Easy-peasy. Oxy-acetylene torch, fastener can't be stuck if it's a liquid.
It is being stored and a clean room that is temp controlled any heat or anything would contaminate the sample.
Why didn't they just use a socket wrench?
This is why you don't send an scientest to do an engineer's job
Pics of the sample in this article
https://www.nasa.gov/image-article/nasas-osiris-rex-curation-team-reveals-remaining-asteroid-sample/