In Texas, the oil and gas sales and volumes are reported to Texas Comptroller for severance tax purposes and are publicly available on the Texas Comptroller CONG website. This is reported separately for each RRC Lease number for every month. If a completion report is not yet filed, then the operator has to report sales under the original well permit number because severance taxes are due for any oil and gas sales. A mineral owner can compare the sales reported to CONG to the sales reported on the voucher. This system is very useful. Maybe the National NARO and the State NARO could propose that Oklahoma and other states which charge severance taxes make this information publicly available.
This question came from a NARO member in OK.