Set up a sign-out sheet or numbered voucher system and store these with the cash box. Document all disbursements from petty cash on the sign-out sheet, which should list the employee's name, the date, the amount of cash withdrawn and the purpose of the withdrawal. As an alternative, fill out a voucher with the same information and give it to the petty cash recipient. When the purchase is completed, the employee returns the voucher, attached to the dated receipt outlining the purchase.