Looks like for a long time Mahler "Kindertotenlieder" had 4 of 5 of the autograph manuscripts missing. Looks like the 5th (No.1 in the sequence) was just found below in the article below:
http://www.dw.com/en/original-gustav-ma ... 7#nomobile
Gustav Mahler Manuscript recently discovered
Moderator: kcleung