What if we made a giant four sided pyramid out of stone, and used the inner 1% of its volume to store your box? We could put it in the middle of the desert, and hope it gets covered in sand.
There is a genuine pyramid theory which posits that the Great Pyramid was, in fact, used for power generation.
It's actually quite fun: the theory goes that the huge mass of the pyramid was used to couple seismic vibrations into the enormous granite blocks above the King's Chamber. Being stuffed with quartz crystals, this generated a varying electric field which excited a hydrogen atmosphere (provided by a chemical reaction in the Queen's Chamber. Or the Subterranean Chamber, can't remember which). The Grand Gallery was apparently filled with Helmholtz resonators which set up a standing wave of some sort, the portcullises at the entrance of the King's Chamber being acoustic baffles to control the resonance. The net effect of all this was apparently that the comparatively thin-walled sarcophagus in the King's Chamber (also granite) would set up an appropriate vibration in the hydrogen to cause a maser-like concentration of microwave energy to be directed up one of the "air passages". Damage in the Grand Gallery is taken as evidence that there was some sort of catastrophic failure that knocked the whole thing out of commission.
It's remarkably complete, and totally, utterly bonkers. I love it.
