casket vs safety-deposit box

casket

noun

  • A little box, e.g. for jewellery. 

  • A gasket. 

  • An urn. 

  • A coffin. 

verb

  • To put into, or preserve in, a casket. 

safety-deposit box

noun

  • A safe-deposit box. 

How often have the words casket and safety-deposit box occurred in a corpus of books? (source: Google Ngram Viewer )