Those missing ones are all related to T'Ris shaved petwalk quest. it is related to getting a unique galaxina episode (20) which the pet owner has in his posession.
Trigger: you have galaxina 19 and you exit your ship at arellarti station. you overhear two dockworkers...
Best ensure T'Ris has EXH 15 (Krell petwalk in Iltari)
The walkthrough in OP should contain necessary detail info