How do white stuffing dice work when you roll several for stuffing?

Question

Accepted Answer

Each roll is compared with your stuffing as it stands at that moment, and a successful roll gains 1 stuffing. White dice can be rolled one at a time, or several can be rolled together as one roll for a higher result. They are rolled only in Find Stuffing, never in combat.

Stuffed Fables

How do white stuffing dice work when you roll several for stuffing?