I dont think the fact that no one apart from the wise is really that significant, i believe Grima would have had some knowledge of Orthanc and the precious artifacts hidden there, i dont believe he knew what is was but he would have definetly known that it was an object of significant value. As i said previously, a large obviously mysterious globe sitting in a wizard's study is not the first thing that i would have thrown.
But as some have said, Grima as the scoundrel that he was might have recognised the significance and was trying to kill two birds with one stone(oh thats a bad pun): in his rage he wanted to injure Gandalf and Co. and also perhaps do some damage to Saruman by removing his only source of information gathering now that his army is routed and Isengard is in ruins.
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