OPT extension receipt notice not received

Hi

We have sent i765 opt extension documents by usps and the documents received by lockbox on November 14. Still we did not receipt number and money order not cashed as well. Also we did not get notification via email or phone though we have included G1145.

Current initial EAD expires by 19th January 2021.
What will happen to EAD status and application if we did not receive receipt notice by 19th January?

Also 180 days extension eligible without receipt notice?

The receipts are delayed and many people are seeing this delay for almost all types of EAD and other applications.

Usually, the SMS and email are sent as soon as the application is accepted after opening the package.