I can give you the list I have have on my computer. Some are live and some are album tracks. Some come from the "A Very Special Christmas Live" album and others from "A Very Special Christmas Vol 2".

Christmas (Baby Please Come Home) AVSCL
I Wish Everyday Could Be Like Christmas
Please Come Home for Christmas AVSCL
Back Door Santa (from the EP A Very Special Christmas)
Blue Christmas
Run Run Rudolph
Santa Clause is Coming to Town (all singers on the album including JBJ)
R2D2 We Wish You A Merry Christmas (very old)
Little Drummer Boy (bootleg only as far as I know)
Oh Holy Night (Richie from Merry Axemas)

There may be more but that's it from my main folder.