Also, from what I understand, the school operated outside the law to pay me for 2 months without a work permit, so couldn't they technically get themselves in trouble as well if they report me?

Can I really be reported? Can anyone verify this? I'm not trying to hang out with a free stay over here or anything. I have applied to a lot of other jobs. My main concern is that I will spend money for a new 30 day stamp and not find a job in time, or spend even more money for a 60 day tourist visa and then have that all wasted when I have to get a new non-B. Maybe it's fairly obvious, but I am sitting on a limited savings at this point so I don't want to make an inefficient financial decision right now.. 😅

Yeah, I still have until March 24 on the original visa.

My employer was saying something about having a quota or limit on how many active non-B visas they can have at a time.. So I'm not sure how that works, or if it's true.. Might be something they made up to guilt me into cancelling my non-B so my life is more difficult, like a measure of revenge. That wouldn't be totally out of character for them to be honest.. One of a few reasons I didn't want to sign on for a year.

There's been no modification or addition to the visa. I got the stamp at the end of December and I've signed no additional papers or made any other visits to immigration since then.

I am just concerned my employer may know some way of sending documents in to immigration (their cancellation letter, the photocopy of my passport pages, the signed resignation letter saying I want to cancel, etc) and then causing a sudden difficulty for me with leaving the country on time.

So they absolutely can't affect my visa on their own? I know they can cancel my non-B if I take their cancellation letter to immigration and ask for the cancellation, but there's definitely no way for them to do that on their own?