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/summon FallingSand ~2 ~ ~ {TileID:54,Time:1,DropItem:0,TileEntityData:{CustomName:"My Chest",Items:[{Slot:2,id:276,Count:1,Damage:0}]}}
/summon FallingSand ~-2 ~ ~ {TileID:54,Time:1,DropItem:0,TileEntityData:{CustomName:"My Chest",Items:[{Slot:2,id:276,Count:1,Damage:0}]}}
You just had to change the '~2' to '~-2'. But I fixed it for you.