This source was given to me back in October by the Miniclip Clubpenguin Forums, and now it has been re-given to me by my brother on those forums. Thanks dude. 
This is a common question. On the Miniclip forums (only people 13 and up) it was answered by Rsnail back in the Summer (yes, the real Rsnail), so here is the answer:
Quote:
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All items will come back except for the Party Hats and pins.
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Meaning, the "rarity" and value of an item doesn't matter unless Clubpenguin says it wont come back, because all items are coming back other than Party Hat's and pins.