Those old toys were closeted in the attic cabinet for many years.

closeted 是动词 closet 的过去分词形式。closet 本义是"壁橱、储藏室"，作为动词时表示"把...关在储藏室"或"隐藏"。这里用过去分词形式表示被动状态，指"被关在柜子里/被藏起来"的状态。