Can my school cancel my work permit in Thailand without my work permit book after I've left the country?

The original poster is inquiring whether their school in Thailand can cancel their work permit after they have left the country for a job in Japan and without having their work permit book (the blue book). They are also concerned about potential repercussions when visiting Thailand again without cancelling the work permit, especially related to re-entry permits and fines for non-compliance. The comments suggest that it is typically the employer's responsibility to cancel the work permit, and while it may be possible for the school to do so without the book, it is advisable to send the book back to avoid future complications with new work permit applications.