At school, Sarah sees Lisa put her lunchbox in locker number 5 before going to class. During recess, Lisa's friend Emma accidentally spills juice on Lisa's lunchbox and decides to move it to locker number 7 to dry off. After school, Sarah wants to surprise Lisa by decorating her lunchbox with stickers. Which locker will Sarah check first to find Lisa's lunchbox? Provide a very short response.
Sarah will likely check locker number 5 first because that's where she saw Lisa put her lunchbox before going to class. Sarah does not have any knowledge of the incident with Emma spilling juice on the lunchbox or of Emma moving it to locker number 7. Without this information, Sarah has no reason to look in any locker other than the one where she last saw the lunchbox.