You will have been issued with extra receipt books. Give your Group Member another one so they can continue to collect cash. Then, record their additional Participant ID on the control sheet, and record their previous Participant ID as lost on the control sheet. The control sheet, receipt books and Banking book must all be returned to World Vision for verification.
If your Group Member has already created their online fundraising page associated with the lost book, they don’t need to make any changes and can continue to receive online donations with the fundraising page they’ve set up.