How does the company handle resumes that have not been interviewed at large job fairs?

A big and good company may crush it with a shredder. I have seen several foreign companies do this, but most companies don't have this machine and will choose to throw it away directly. I have worked in the personnel departments of several companies, and I just threw them away. It is also possible to throw it directly at the venue after the job fair. So when you are looking for a job, you only send your resume online, especially if you want photos.