You may write to Customer Care and mention your inability of finding an Appraisal.
They would be in a position to guide you further.
You may submit the email of the Seller as a proof if he has committed, anywhere in his mail, that a 128 mb player was sent instead of 256mb mp3 player.
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http://stores.ebay.in/IndConcepts
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best regards
Umang Midha