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>The evidence mentioned here are the addresses of the Command and Control servers. But the author does not give any reason for why he or she thinks this is the thing the FBI is being cryptic about?

The fbi and several other sources publicized the select portion of the code base that linked the ips to shamoon. Presumably, the piece the fbi is being cryptic about is the servers behind the proxy, which, as mentioned, it probably isn't too much of a stretch to guess the government might be able to trace.