So I'm out of the business now and quota guidelines have changed to a quarterly system (?) so i could be talking out my ass.

https://www.federalregister.gov/documents/2023/08/31/2023-18885/management-of-quotas-for-controlled-substances-and-list-i-chemicals

Rubber stamped might be over stating but shipment reports from registered manufacturers are reported, audited and archived for a long time. Records of shipments are constantly monitored between the distribution centers. How much active ingredient was also explicitly decided by the DEA iirc. So if a manufacturer needed to increase it's output of a schedule 2 narcotic by a significant amount it must request the additional quota and it then goes through an approval process.

To go a step further and show just how significant quota is let me give you an example:

You have a shipment of product ready to go. Certificates of Exceptions/Assay/whatever paperwork you need to release. It's been transitioned to the distribution center. You then find something that impacts that material and it needs to come back to the manufacturing (gmp) area. Once that comes back into the facility and then leaves again it will count against your quota. If 100kg of active leaves twice it's 200kg as far as the DEA is concerned and you will have to destroy the left over 100kg you were provided and did not use.