When the gates go off for users exiting the building ask about books FIRST, laptops LAST.
Ask: do you have any books: from other libraries, used textbooks, books you bought on-line? Eliminate possible book issues before moving on to electronics.
If it turns out to be a laptop please encourage the patron to consider using the entrance/exit on the second floor of the Library Addition, explaining that we will have to call them over every time the gate goes off when they’re leaving and it’s frustrating for them and for us.