The /testforblock command does not test for chests with items in it, even if you have the correct NBT tags. The command block says that the chest does not match the NBT keys, but it actually does. I even kept the NBT tags the same, turned it into a /setblock command and then changed it back to a /testforblock and it says that it doesn't have t he correct NBT tags. I woudl really like this bug to be fixed before 1.7 is officially released, because my entire gamemode I am making will revolve around that particular command that isn't working at the moment.