I am reading a book "Denying to the grave". In one paragraph, the author writes:
Always ask "Compared to what?" and "What is in the rest of the boxes?" when someone makes a claim about the risk or safety about anything regarding our health.
I don't think I really understand the contextual meaning of "what is in the rest of the boxes". I searched for the definition on the Internet or tried looking it up in dictionaries but I have found nothing.
I guess "the boxes" here have something to do with risk assessment. So what do they refer to?