What category does a pharmacy posing sample box fall under

Medical equipment category.

According to Baidu's library: drugstore posing sample boxes belong to the medical device category because they are used to store and display medical devices. In the definition of medical device, it includes equipment, apparatus, machines, components and other related items used in the diagnosis, treatment and prevention of medical diseases.

Sample boxes are often used to store and exhibit sphygmomanometers, stethoscopes, syringes, masks, infusion sets, and more.