Cancelling work permit

Hi all,

I have a quick question. A friend of mine is getting a new job and needs the cancellation receipt from her old work permit. She handed over the WP to the foundation she was working with to cancel it, but just found out they never cancelled it. She stopped working with the foundation and cancelled her nonO visa months ago.

So here is the question: can she go into the labor office here (in Chiang Rai) without the physical WP to cancel it (the WP was issued in Chiang Mai)?

If she can do that, what paperwork does she need?