If the routes at https://harmanliikenne.fi/en/seinajoki-local-traffic/route-map/ are still correct (and I don't doubt that) then there are quite some local bus routes missing:
2, 3, 6, 7 (1/5 are partly wrong - there is a 7 serving Eskoo instead of 1 and 5 is not going to Karki), 8, 10, 11
Or put otherwise, only a very few are somewhat correct and complete. I know how hard PT mapping is (or anything related to relations that often get butchered by other users for that matter) but it is so immensely helpful if you can rely on it... good luck :)