I have MP3 files of the two mysterious piano rolls.
All it says is "Masque of the Red Death", but lists no composer.
The only other info on the rolls is "Roll 1" and "Roll 4". (Rolls 2 & 3 are missing).
I've compared it to Andre Caplet's piece "Conte Fantastique d'après La Masque de la Mort Rouge"
and Edward Collins' piece, "Ballet Suite Masque of the Red Death".
Neither of those two compositions come close.
The piano sound is midi so it won't be perfect piano sound.
The pieces sound disjointed in a few places - as though they belong to different pieces.
If anyone would like to try to identify the composer, please ping me off line.