Tom, agree with your points, but it seems to me that the real value in a car like that is as much (or more) in the supporting documentation as it is in the physical condition of the car itself. As a potential buyer, I would be very concerned about the possiblity that this is a (albeit nice) '53 "clone".
If it's indeed real (giving the benefit of doubt), the ad reallly does not do a good job of marketing it. The verbage in the ad is all "fluff", and there is no mention of paperwork at all.
To the originality question, the ad says, "It has been wonderfully maintained and is as good...if not better than when it came off the line in '53. The car still has the serial number and we have retained almost all its original parts." Even that doesn't really say a lot...e.g., is a prospective buyer being asked to bid on a Bowtie candidate car? I don't think so...but again, it's not really clear. There's no mention of the car ever having been judged.
To get max value for this car, the dossier will need to be in order. If it were, I tend to agree with Mac, it would probably be going through another venue. I believe it would also bring more than $98K, the price at which this auction stalled out.