AFAIK, anyone can turn in the mirror. That spawns the haggle baron who tells you to bring him a quill, parchment and a shard. At that point I doubt you need to MQ. As long as hes up he should only want those 3 items. The quest does not specify handing in the mirror again if the baron is still up.
Prior to summoning the haggle baron the player would not know a quill parchment ect is required. So technically a mirror may have two uses for two dif turn ins.
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