Hollow Form with white interior (1963) sold for £4.8m hammer price at auction in June 2022. This is a seminal work of Hepworth's, from a time (the mid 1960's) when she is widely perceived to have been in her creative heyday. To me, this poll therefore just begs the question how much would a decent set of pissflaps fetch at Christies?
It would need a formula similar to the Doppler Shift to even begin to answer that. It needs adding to the list of mankind's most important questions, along with "what is Zippy off Rainbow".