Found an exploit, controversial fix.

I'm submitting this to you since it's pulled off your latest, not the openmw one.

As written the code allows a player to unlock an evidence chest, then cast a magnitude one lock spell at it.
From then on that evidence chest will be reset to locklevel one.

Fixed it in dbc4368, but I'm not really happy with that solution.

Thoughts before I open a bug report?