President John F. Kennedy was assassinated on November 22, 1963.  Plans for a library had been considered before then; presidential libraries have been established since 1939 to contain records and other information about presidents and their administrations. 

Here are both a correspondence card thanking the sender for his/her sympathies upon President Kennedy’s death and a card from the Kennedy Presidential Library in thanks for a contribution.  (The effects in the Kennedy library contained not just papers but effects also effects of a personal nature; therefore, the library’s name was changed to The John Fitzgerald Kennedy Presidential Library and Museum.) 

Both cards are in their envelopes, franked by Mrs. Kennedy.  Those envelopes have the sender’s name whited out, and clearly were not opened with a paper knife, as you can see in the photos.  Otherwise, they’re in good condition.