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MVSNYCdan- hate to disagree, but a neg feedback is bad...rather be out $50.
joe- try contacting eBay and explain the situation, maybe they have his email on file or a phone number (that way you are not just simply contacting him thru eBay, you can send him an email or call him directly)...
worst case send him the $50 plus a few extra bucks to cover whatever the insurance might be.