When storing Asian pears loose in a box, it is a good idea to clip the stems short, because the stiff stems can puncture and damage the fruit. Fruits that rub will often become dark at the rub points. For long term storage of any fruit, the key words are cool and ventilated . Cooling slows down the fruit respiration, which slows down senescence. Ventilation keeps ethylene and carbon dioxide from building up to damaging levels.
Some people use old refrigerators set aside just for keeping fruit.
If that is impractical, choose an area with low heat that does not go below freezing. A garage or shed, unheated porch, or dry basement area are possible locations. Avoid direct sunlight or areas with a wide range in temperature. Avoid confined unventilated areas. Fruit can be packed in ordinary boxes lined with newspaper or other padding.