I believe the original thought was that they had shards or chunks of the comet at the museum, so the plan was to A) steal a sample and B) learn what they'd managed to discover in the museum.
I don't really know how museums work, but thanks to the media I assume there's some kind of laboratory style setup where they research things ;~)
In any case the reality is that there doesn't seem to be any samples of the comet (at least not at the museum), much less any research to snag.
So I think it was just a misunderstanding and that you don't need to be pulling a mission impossible.
Also I believe that CB is currently laid up due to a bad back injury, in case anybody is wondering where he's been off to.
Wishing you a speedy recovery, man.