I'd express my concerns to him, perhaps through a certified letter to both addresses. Tell him you are giving him the benefit of the doubt but you are very concerned. Tell him that you do not want to involve the authorities, but if you don't hear from him you will have no choice. Tell him that he needs to do something to show good faith. Perhaps ask him to send your money back as that will be easier during his family crisis than sending the bumpers, and that you are still interested in completing the deal when he is able. Then he's been amply warned, you've been the good guy in every way possible, and when you call the police they'll be no pissing contest. Then call the police if you don't hear from him by a deadline that you've explicitly given him. IMO, you want to stay businesslike and balanced between being understanding and being serious about protecting yourself. IMO you should avoid doing anything that could be construed as harassing... like calling at odd hours, or calling more than once a day.

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1987 W201 190D