I asked Marc at TCNC the very same question while previewing some auction lots at the RCNA. He said that the consigner had only these two G/R notes and didn't realize they were test notes until the auction house pointed it out.
This is a similar happy story to the fellow who found out his mother's Bird series $5 was a GOGO test note.
I believe bidding on both G/R's was reasonable but not overdone. Perhaps bidders were cautious, given your concern, and only willing to pay for "nice Unc" rather than bid up to a silly 67 number on a plastic holder.
These new notes expand the population of G/Rs and fills out a full grade range from VG to Unc. It will be interesting to see what Charlton does in the next edition.