Thnx fo answer!
But I`ma allryd serched out all locations of the game (even solved stupid treasure Map quest... ) , exept some Ester Egg`s location , but I readed about it after
game is ended , and I dont wonna reload...
Of course defeated all monsters (maybe one or two is left , i dont know , I can missed some ones) , solved all quests (exept: bugged ones , and George`s Plant., and I refused not justy quests like a "Burn the Cart" etc. ) , I found that key , but I think that happened after I used cheat once to get through that bugged Nericon`s gate , and second time , when I needed to get in the Castle , coz I forgot to took
the Shield for the some very good set of armour, but that was a not cheat , just a throwing in the Teleporting PYRAMID ^_^... And yeah I founded the key to the graveyard

and the very good armour too ... .
In some place , in the game I founded the Head of somekin` CHEROKY-folk (under the Warrior`s Guild) , with a somekin` of symbols under it. I wonder is that a cipher or something like tat` ?