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If you never signed a PoA for him, then the only way he could get it would be through going to the local court. Thus, you would check in the local court if he refuses to show you. If you cannot find anything in court and you did not grant him a PoA, you need to file a police report for theft against him and also you can sue him for him taking your property without your consent.
If you did grant him the PoA (I am presuming from what you said you did not give him the PoA) you can rescind any PoA you granted in writing. If he has a court PoA, you have to sue in court to revoke the PoA. If he has no PoA at all, then you need to sue in court on top of making the police report for theft against him.
If you file a police report he will have to produce the actual PoA as proof and you can see how it was granted and know how to proceed.
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