[IDEM libro primo definitionum. ] §18.1.74.prClauibus traditis ita mercium in horreis conditarum possessio tradita uidetur, si claues apud horrea traditae sint: quo facto confestim emptor dominium et possessionem adipiscitur, etsi non aperuerit horrea: quod si uenditoris merces non fuerunt, usucapio confestim inchoabitur.
[THE SAME, in the first book of Definitions.] When the keys are delivered, the possession of merchandise stored in warehouses is deemed to be delivered only if the keys have been delivered at the warehouses; when this is done, the buyer immediately acquires ownership and possession, even if he has not opened the warehouses. But if the merchandise did not belong to the seller, usucaption will immediately begin.