Tom,
There is a phenomenon in northern Australia where rubber thongs [or as they are somtimes know,'flip-flops'] get washed up on the beaches. They are nearly always the same foot [cant remember which one].
The theory is, that because each [left and right] thong has a unique and different aerodynamic and aquadynamic shape it travels in a certain direction driven by the wind and currents.
So the left foot thongs end up in Darwin..and the right foot thongs sail on to Fiji or somewhere else.
So possibly all the left feet, in this instance, have landed on some deserted beach in Greenland....or are still bobbing along on the high seas.
😆