I work in a fairly poor urban library and we do use RFID chips, which are great for self checkin and checkout. They’re on everything, including wee DVDs.
Every few years we have a run on toilet paper (in one series of instances, a lady would bring a bunch of kids in a couple times a week and they would break the paper holders and conceal massive amounts in the kids’ backpacks). A bunch of RFID tags inside the TP rolls, and you’ve found the culprits.
Moral: Don’t steal from libraries. We’re here to help you borrow things for free.
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