Finished FE 9 and now i can open FE 10, now the patch with two additional chests for premium items can work or not yet? Also how i get Enemy Eye on Lucia
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Yes, the chest for Premium Items should appear after FE9. Even after finishing FE10, there are still plenty of Premium Items you can go back and get, so only the permanently missable ones are unlocked. Do keep in mind the FEX chest also requires clearing Coriander Maze.
Enemy Eye can be learned after reading Tips for Tomorrow II in Champollio Library. You need to read Tips for Tomorrow I twice before it becomes accessible.