2. Before a trial is had on the merits of a possessory warrant, the executing officer should seize and have in his possession, and is the authorized custodian of, the property in dispute until a final judgment is rendered by the officer issuing the warrant, if there is no certiorari, or until the certiorari is finally disposed of, if one is sanctioned within ten days from the judgment complained of. Code, § 82-101 et seq.; Sumner v. Bell, 118 Ga. 240 ( 44 S.E. 973); McCants v. Underwood, 70 Ga. App. 641 ( 29 S.E.2d 287). 3. While any public property which has become unserviceable may be sold or otherwise disposed of by order of the proper authority (Code, § 91-804), a county commissioner cannot sell or otherwise dispose of any public property unless the same becomes unserviceable ( Killian v. Cherokee County, 169 Ga. 313 (2-a), 150 S.E. 158); and public property becomes unserviceable within the purview of this law so as to empower the proper authority to sell the same when such property cannot be beneficially or advantageously used under all the circumstances.