U.S. Citizenship and Immigration Services will not use pre-paid mailers to send out any communication or final notices for fiscal year 2021 cap-subject H-1B petitions, including those requesting consideration under the advanced degree exemption.
The process of printing and mailing the cap-subject H-1B petition approval notices by first-class mail is fully automated. Using pre-paid mailers requires a separate, more time-consuming manual process. The existing automated process is more time efficient for both petitioners and USCIS. Because of this, we will use first-class mail as we work to process all cap-subject petitions in a timely manner.
Official news published at https://www.uscis.gov/news/alerts/fiscal-year-2021-h-1b-cap-pre-paid-mailer-suspension