Hayek himself almost never treated knowledge as a "thing. [contrarian]
There is an important conceptual distinction to be made here, brought to my attention by John O'Neill. Hayek himself almost never treated knowledge as a "thing," but instead rather as tacit, local, and embodied—rather similar to the way in which Michael Polanyi described science.
Philip Mirowski & Dieter Plehwe (eds.), The Road from Mont Pèlerin, loc. 2162