Seeking reimbursement: When buying supplies for a fundraiser or other event, remember to ask for that extra receipt. You will be able to provide proof of the purchases for reimbursement and retain your own copy if you need to exchange items later on.
Rebates: All too often rebates go amiss. Keep a backup with the extra receipt and copies of your rebate submission. If the company loses your rebate information, you'll have proof to get it processed and have a second official receipt if needed. Keep in mind the receipt may indicate it is a copy.