Getting the magnetic lock/unlock work with a mod?

I recently bought an e-reader and I bought som cases from ebay however the magnetic unlock and lock function of the device doesn't seem to work. My friend got an Kobo Aura H20 and the function works just fine there. There is a magnet on the case and when you close it, then device locks. When you open it the device unlocks automaticly. I didn't think about it when I bought the cases, thought that all that came with magnets should work.

However I wonder if it's possible to do some kind of mod to make to the case so the device react to the magnet anyway?

Tablet is Kobo aura and the case is these: http://www.ebay.com/itm/kwmobile-LEA...item43df05445a