cachet vs sealing wax

cachet

noun
  • A commemorative stamped design or inscription on an envelope, other than a cancellation or pre-printed postage. 

  • A special characteristic or quality; prestige, especially via association. 

  • A sealed envelope containing an item whose price is being negotiated. 

  • A capsule containing a pharmaceutical preparation. 

  • A hidden location from which one can observe birds while remaining unseen. 

verb
  • To mark (an envelope) with a commemorative stamped design or inscription. 

sealing wax

noun
  • Wax formerly melted onto a letter to seal it; the picture of the sender's seal was often pressed into the wax as evidence that the letter had not been opened. 

How often have the words cachet and sealing wax occurred in a corpus of books? (source: Google Ngram Viewer )