Can you solve the MAGNET RIDDLE? ft YouTube CEO Susan Wojcicki

without breaking it... here are 2 solution i can think of,
1) tie individually on a string and see if it response to earth magnetic field, if it response, it is magnetize
2) use the file, to file/chip some metal off from ONE of the bar. if the "powder" that got chip off response to both bar, then those are magnetized (hence that bar is magnetized one), and if it only response to one bar (then it is not magnetized)
i can't think of what to do with the cabinet yet tho