@Paul ***********
When I got mine all I needed was passport, copy of passport, copy of entry stamp and extension stamp, copy of TM.6, and then the usual forms for an extension plus the form to request for Covid extension. But I also had my TM.30 and copy of lease just in case as others has mentioned they were asked but they did not ask me. Was very simple and straight forward for me. Under consideration stamp for 10 days or so and that was it. But it seems to depend a lot on the immigration officer so I would just come prepared :)