Starters "supplied" to scorer?

[slow whistle]

Sat night BV I am R. So I go over with around 11 mins left in pre-game to check books. They are not ready, but I ask the official scorer if he has everything that he needs, he says yes he is just copying. Fine, so we go get captains and do pre-game. I get back over to check the book now there is around 7 minutes left. I go to check the home team and see that they have no starters checked so I ask the official scorer and he says "oh yeah it is usually the top 5" (of course the V scorer is sitting right there listening attentively). A home assistant is standing nearby and hears the discussion so he chimes in, "It is ALWAYS the top 5 for us". So I check the top 5 and move along. My question though is what does the H team have to do to satisfy the requirement of "supplying the scorer" with the starters? Should the HC or an assistant actually be transcribing names/numbers/starters into the official book, or is it appropriate to rely on the scorer to do so from say, last night's game? And if so are they then on the hook if the scorer has a brain lapse like this?