If you use the amazon advanced search option and you type in 'system apocalypse' (with or without quotation marks) and you go to the right to 'Pub. Date' and do 'before' and 'August 2017' (around when the first System Apocalypse book was published) you don't get any relevant search results other than Life in the North. I couldn't find anything by searching the first three results pages of '"system apocalypse" before:2017-07-02' in Google either.