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If you have his address send him a registered letter, return receipt requested, stating that if you do not receive payment in full by X date then you will be refunding his money, less any costs to cover feeding and care since March 1 when the final payment was due. Since you have been unable to make contact by phone or email, I would push the date out another 30 days to give time for the USPS to deliver the letter.
Also, have you tried looking for the guy on facebook, or googled his name to see if an obituary pops up?
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