It really depends on how the receiver deal with data. There is some platforms that will update the list of IoCs after some amount of time. On the other hand you can try to disable IDS flag on the MISP and delete the IoC on the destination that already receive the IoC as black list.
However, you just need to remove IDS flag if you don't have the enforcewarninglist flag active on the query and if you don't have any warninglist feed active.
Please take a look on this:
Hope that you can manage it. It's really hard to deal with false positives!
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