No, Bruce. The set on EBay is not the Carnegie set. That one is listed through Bookfinder.com and is a specially leather bound and decorated set offered by Urdus Books. I think they are asking something like $5775 (or thereabouts) for that one. The EBay one is the same edition as mine, except that it isn't falling apart, as mine is! Mine is #862 of the 1000 printed.
Let's face it, folks, the four Bronson volumes are much more valuable for people who want to SING the bloody ballads. The handful of tunes in Child's (Kittredge's?) addenda are not of much use.