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Seems obvious, but did you verify you got the batteries in right-side up? You didn't mention that you checked the polarity of the batteries in the case.
Key fobs, even if they've lost their programming (rare) and won't lock/unlock doors still flash the little red light. Why neither of yours are flashing is really odd.
You know, you could swing by a dealer and show them to the parts guy and he may be able to help you for free.
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