It probably won't be the last time it happens, krankyboy. I do my best to figure out which books I really have, but it's especially perilous with coverless issues. The GCD is filled with "placeholding" data on issues which do not reflect the sequence of the stories nor first hand data on them. Often the seller is just guessing at the issue number.
For the record, most of my coverless Fox comics came from Terry's Comics in southern Calif. and have been purchased in the last five years or so. Terry comes to WonderCon in San Francisco every year and I always check out his coverless selections. Terry, Jim Payette, Dick Swan and Brian Peet of A-1 Comics are the few folks I still buy from - when I have a spare buck or two.
It's getting harder and harder to find stuff I need at a reasonable price...
FYI. (|:{>