I'm with some others in the thread in that I question the validity of these claims and statistics, do you have any sources for this material or is it just something you've heard? Although I have heard that an extremely large number of early bitcoins mined and addressees used were not taken very good care of and got lost in the abyss. Many were lost during tests of security, integrity and many were lost to just plain carelessness.

When you say "FBI" are you talking about the individuals that make up the FBI or do you mean the government entity itself has an address or multiple addresses under it's control? If this is the case do you happen to know why that is? Are they simply interested in the technology, or do they have motives beyond that?

I'm also going to assume when you say "never been used" you are referring to have never been moved since being mined, or am I naive to think that is the criteria? Please explain if i am mistaken, because I believe that whatever definition is labeled on "never being used" could simply be explained by "HODL"ers or something similar that just happens to be very prevalent among our community.

Last thing, does "top 1000" addresses mean the address with the highest amount of bitcoin going in/out within a given period, or does it just mean the addresses with the highest quantity of bitcoin in them currently? I'm just trying to get a more firm grasp on what you are presenting here, and it's really difficult without a citation, sources or some explanation/definition of these terms... I may be ignorant, so let me know if I've missed the memo where these were defined officially. Without that though it reallly is hard to do any sort of analyses or conversation on this, so unless you're just trying to spout off random facts then clue me in, please!