I think you are out of luck with your eBay key.....read the below post and pay attention to what Gilly writes on page 1 & 2. The end of page 2 concerning how the key communicates is particularly interesting.

http://www.peachparts.com/shopforum/showthread.php?t=168471

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)