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Hello @vitor_d
First you need to define the definattion of used. Does that means recieved an email? If yes, then you can query the lists and then add segment code to each lists. And finally check the lists against the delivery logs. If the any member matches then you can consider the lists as used.
But there could be a scenario, where many users in the lists were never select becuase they were added after the last deployment or email send.