(from Charles Tomlinson's article, "Simpson's", B.C.M., February 1891, page 53)."The last illness of De La Bourdonnais was said to have been occasioned by the great mental strain of a blindfold game with Boncourt."
See also Tomlinson's article, "On blindfold play and a post-mortem", B.C.M., August 1891, pages 380-388, which gives further information, including the score of the game against Boncourt.
I haven't checked what, if anything, Le Palamède had to say on the matter.