loose magnet in a case iron t-case?

I have a magnet stuck to the outside of the cover of everything that holds fluid that isn't aluminum. I'm hoping any debris inside gets attracted to the magnet through the cover. I suppose I'll find out the next time I pull one.
 
I keep some flexible plastic magnet material in the garage ( a 1/2" by two foot roll, cost a few bucks). And epoxy a piece someplace, out of the way, inside of the case. If it does ever come loose or migrate someplace, the chances of serious damage are minimized.
 
RTV it down for an extra precaution.
 
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