I'm not sure if this is what you're looking for, but this link has a section that talks about which aftermarket blank works with which Givi lock series. StackPath Perhaps it would make sense to a locksmith? Good luck.
those case keys are absolute horrible quality. theyre thin and they snap very easily. what I did was disassemble mine from the bottom, though mine was from coocase and I measured the lock and ordered one from ebay through an asian seller. they are like post office box locks and very easy to find. will take time though to get to you. there should be some small nuts from the inside that will help remove it.
this is of course no good if you locked it up and lost the key. in that case, youre screwwed
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