Here is another early cabin key, from an ebay sale already closed (scroll all the way down to the bottom of the page) :
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Myles, your key fobs look much more stylish! I also have a key fob like the one on the right -- it broke and fell of my key while I was on board and was then replaced by the Purser's Office. A nice one, and I still have it somewhere, unrepaired -- but sadly, it does not say QE2...