Bohr wrote a letter to Heisenberg, but characteristically he didn't send it. He went on redrafting it, just as he had always redrafted his scientific papers. In fact he went on redrafting it for the rest of his life.
What he was trying to do -- also very characteristic of Bohr -- was to be very precise about what had happened in the meeting as he recalled it. I also think he was trying to find some way of disagreeing with Heisenberg, without hurting Heisenberg's feelings.
The letter was found after his death among his papers.