I"m still not understanding what's taking so long on the letters.

This letter confirms that, effective June 1, 2016, all publication and related rights granted
by you to Booktrope and/or Libertary Co. (“the Company”) for books you submitted to
the Company will revert to you as of that date, without further notice.

This reversion of rights includes all publication rights you granted to the Company, and
any subsidiary or derivative rights, and/or distribution rights you granted to the Company.
That was the entirety of our rights reversion letter for BT. 70 words. How hard can it be?