Christmas box         
noun [ C ] UK old-fashioned uk/ˈkrɪs.məs ˌbɒks/ us/ˈkrɪs.məs ˌbɑːks/
 (给邮差,送奶人等的)圣诞贺礼(尤指金钱)
a small present, especially of money, given at Christmas
  圣诞盒
a box containing small presents sent to someone at Christmas
  The British and Germans both sent Christmas boxes to troops on the front line. 英国人和德国人都向前线的部队发送了圣诞礼盒。