Cloak of Mirroring is the only item which you must pick up after you kill the first Jon. All other items that he takes from you appear in your inventory when you destroy specific enemy.
But there is a bug - sometimes Jon doesn't drop his cloak, especially if you "chunked" him. 
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I grow tired of shouting battle cries when fighting this mage. Boo will finish his eyeballs once and for all, so he does not rise again. Evil, meet my sword! SWORD, MEET EVIL!<br />- Minsc
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