Though I couldn't find anything specific on the recent sacd or immersion box sets this analysis is interesting to read. Starting at page 3 for the Table of Contents, eventually true sales numbers are elusive even with this concept I believe. At one time Birdland Records of Australia had the Dark Side of the Moon Sacd sales at over 1 million on their home page but I see as of 2019 the page has been updated.
https://chartmasters.org/2017/06/cspc-pink-floyd-popularity-analysis/3/
https://www.birdland.com.au
https://chartmasters.org/2017/06/cspc-pink-floyd-popularity-analysis/3/
https://www.birdland.com.au