"The Express Office" (He is coming to us dead)", version from Randolph, is in the DT. Randolph printed two other versions, (Boy(s) in Blue.
Score at Numachi.
Also see post by Stewie.
Lyrics to the Grayson and Whitter version are given in "Long Steel Rail," Norm Cohen, and in the Google excerpt on line; titled "He Is Coming to Us Dead)." They may have been the source of the "Boys in Blue" line in the last verse of some versions.
Published 1899, both words and music credited to Gussie Davis (not seen). Cohen says Grayson's tune is simpler than the one writen by Davis.

Norn Cohen speculates that there is an antecedent.