*Posting for a friend*
We have been reading and following on posts and this group for about 2-3 weeks to get a clear direction or successful case of people getting off amnesty visa. Yesterday we saw comment reply to a post (Linked below) saying that she was able to do so using this letter. So, today my friend went to CW presenting this document and he was able to get back on his Non-B work visa until amnesty period end.
His original Non-B work visa expired on 25 March 2020, and all the borders got shut down on the same day he plan to do visa run. He manage to get his visa stamp which expire on 28 April 2020 at CW using letter from U.S. embassy. After this visa expired he have been on amnesty and in order to switch or extend any type of visa you must have to a valid visa stamp first so he have been asking the U.S. embassy to issue letter, but they wasn't giving that out until recently.
At first he plan to get his visa extension using letter from the U.S. at MT, but we saw this post from Julie. I read this letter and clearly ordering the immigration staff to put a stamp on passports, because many foreigners are facing issue contacting government offices.
So he print out this letter and went to CW and they have him fill up some form, and got Non-B visa stamp which will expire on 26 September 2020. No question was ask, except why didn't you come sooner. No ask of letter from embassy and no fee.
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TLDR : Answer Summary
A user successfully transitioned from an amnesty visa to a Non-B work visa by presenting a letter from the U.S. embassy at immigration. His original Non-B visa had expired during the shutdown of borders, leading him to remain on an amnesty visa. After recent changes, he was able to obtain a visa stamp that extends until September 2020. However, it was noted in the comments that this stamp does not equate to a full Non-B visa, and there are urgent timelines for applying for the actual Non-B visa.