cardboard box vs shipping container

cardboard box

noun
  • An industrially prefabricated box made from cardboard, primarily used for packaging goods or materials and often recycled. 

shipping container

noun
  • A standardized reusable steel box used for the storage and transportation of materials and products within a freight transport system. 

How often have the words cardboard box and shipping container occurred in a corpus of books? (source: Google Ngram Viewer )