Joshua,
As far as I can tell it's doing a wildcard search looking for "*RC" because not only can those reports include XRCs, in my case it included Ken Griffey Jr's 1994 Stadium Club #262 "HR Club" subset card, which has the note "HRC" and obviously shouldn't be included.
So my recommendation would be to check with Admin about that. If you happen to do so, will you please ask him to correct the report to "Rookie Cards of Hall of Famers" (without the incorrect apostrophe in "famers")? Or if you don't get a chance to report that please let me know and I can do so. I'm glad you noticed that since fixing that will make that report more accurate and useful.