I quote myself, weird. But yes, in the LFR and LFG you don't have your own save, thus you can't lookup what bosses are already dead when you join.
Originally Posted by Vladinator
<snip> It's just that since LFR don't have it's own lockout id like regular once, the game can't tell you because Blizz didn't make API for it<snip>
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The reason you can't track what bosses are dead in the looking for dungeon groups is the same reason you can't track what bosses are dead when you enter a 5 man dungeon, you do not have a save to parse and extract the information from.
The LFR API will only tell you what bosses you have already defeated and that you can not roll on their loot. It does not mean that the LFR you join have those bosses dead, if you like me run several LFR's to help friends and such, using these API functions would be inaccurate.