I take the thin ones(where the carcass frame is thin) and without the cover/face I lay it flat on the ground and try to run over it with a truck tire.
Usually it will collapse down almost flat. The older/thicker steel ones are pretty stubborn and won't collapse. Almost half of them will collapse which saves a lot of space, be sure to wear gloves as it tears the metal, sharp edges.
P & M Recycling - Specializing in E-Waste Recycling. 
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