In response to a comment made in my lenovo z470 review, there was a coment about magnetized spots. Using a paperclip I have confirmed that yes there are magnetized spots. I could find 3, all shown as red on the pic above.
Without opening my laptop I really can't tell why there are magenets there. Its far away from the speakers and there are no obvious motors there. Any fan should have shielded magnets.
This probably poses no hazard since magnetic media like floppy discs and cassette tapes are rare these days.