Lock and key

I asked a key  
who had found his lock:

  "How did you know?  
  What did she say  
  to convince you?"

He looked at me a while,  
then told me:

  "It's wasn't so much  
  what she said --  
  as what she didn't:

  a seamless joining together;  
  a lack of noise  
  to proclaim ill-fitting;

  an absence of effort  
  where before  
  there had always been."