Both Kolagan Warmonger and Recruitment Officer have an ability that says to look at the top 6 and 4 cards from the library, then you can show a card matching a condition from among them and put it in hand, and finally put the rest at the bottom of the library.
If I don't show any card, because there is nome or simply not wanting to, must I return all the cards to the top or to the bottom of the library? I think it is the bottom because there are cards that explicitly say "if you do" and this two cards don't, but I'd like to understand the correct way to play these cards.