This npc wasn't written to support multiquesting, so if you turned in the items individually, he would have eaten them. Turning them in all at once, should have yielded a reward.
Pending update:
-Menkes Tabolet's quests are now multiquestable.
Quote:
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I want my money back and my pelts.
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You may create a petition/exploit thread for reimbursement and the situation will be investigated.