Tosefta for Pesachim 15:12

Holes in the upper and lower [walls of] the house, the mattress, and the cellar, and the roof of the house, and the roof of a closet, [and] the grain storage, [and] the cowshed, and the woodshed, and the storerooms -- [specifically,] the wine storeroom and the oil storeroom and the produce storeroom -- there is no need to check. Rabban Shimon ben Gamaliel says, [if] a couch is separated from the house (i.e., it is raised up such as to create a storage area under it) and there was wood or stones under it, one checks the outer side but there is no need to check the inner side.