coin purse vs treasure chest

coin purse

noun
  • A small bag or pouch designed for carrying money, particularly coins. 

  • Testicles. 

  • a type of theatrical performance undergarment used to hide male genitalia, by stuffing it into a pouch with a drawstring, to simulate being nude 

treasure chest

noun
  • A chest filled with treasure, especially one used by pirates, etc. 

  • Any source of something valuable or beautiful. 

  • A treasury, especially a state or royal treasury. 

How often have the words coin purse and treasure chest occurred in a corpus of books? (source: Google Ngram Viewer )