attaché case vs pail

attaché case

noun
  • A box-style briefcase, scrunched over a hinged frame that opens into two compartments. 

pail

noun
  • A closed (covered) cylindrical shipping container. 

  • A vessel of wood, tin, plastic, etc., usually cylindrical and having a handle -- used especially for carrying liquids, for example water or milk; a bucket (sometimes with a cover). 

How often have the words attaché case and pail occurred in a corpus of books? (source: Google Ngram Viewer )