Where a delivery is claimed, an affidavit must be made by the plaintiff, or by someone is his behalf, showing: 1. That the plaintiff is the owner of the property claimed (particularly describing it), or is entitled to the possession thereof; 2. That the property is wrongfully detained by the defendant; 3. The alleged cause of the detention thereof, according to his best knowledge, information, and belief; 4. That it has not been taken for a tax, assessment, or fine, pursuant to law; or seized, under an execution or an attachment against the property of the plaintiff; or, if so seized, that it is by law exempt from such seizure;
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5. The actual value of the property. SOURCE: CCP § 510.