How to verify police search warrant

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As the title says how can someone verify a police search warrant is valid, if it has been signed by a magistrat, how does one go about veryfing it is a valid search warrant.

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A - I have read it
B - when I asked for the warrant they gave it at the end of the search, when I contacted the court that was named on the warrant they advised they could not recognise the magistrate that had signed the warrant.

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A - I have read it
B - when I asked for the warrant they gave it at the end of the search, when I contacted the court that was named on the warrant they advised they could not recognise the magistrate that had signed the warrant.

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Thank you for te replies, reason I ask is because it happened on a Sunday in the afternoon, so I guess they acted on some intelligence, but the person they were after does not live at my property. Magistrate signing out of warrant would explain why my local court can not find the magistrate named on the warrant.