I've already had 2 book T's this year.Both in tournament play.During tournaments I ask the coaches on the first day to verify all names and numbers are correct.Then they say all good or make any corrections necessary.On each subsequent day I ask for the starters & assume all numbers are correct unless the coaches or scorekeepers tell me to make a correction.

I think you're over-assuming.

I'd ask for a roster and then compare that to the previous day's list or just enter the new roster.