The way I remember it, when Kunark first came out, nothing was soul bound. if you died inside sebilis, you had to be rezzed back in or do the quest again. Then sometime during kunark (I want to say it was fairly soon after release), they added the soulbound feature.
I'm almost positive that keys weren't soulbound right away, but thats just from memory....
...which may not be the most reliable source since i don't remember the teeth mentioned for the ports. I do remember the key needed to go from skyshrine to cobalt scar though.
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