What a fascinating item to transcribe, Marsha! Though the library does not already have a digital transcription of this document it's certain that researchers have seen and used this document before, both by viewing the original in the Manuscripts reading room or seeing the digitized version on the library's website. So the telegram may have been transcribed in those individuals' work.
As a community manager for the transciption project, my knowledge of the long history of research and use of this archival collection is limited. I've asked librarians from the Manuscripts Division for any detail they can add.