I guess anything is possible at an auction, as you mentioned seeing the same car at a later time at the same auction. I have been to many Mecum auctions and I will agree , from time to time, I have seen the same car go through one auction and then see it months later again at Mecum, but it is very rare. Usually those cars that repeat in a later auction are high end quality rare cars that bring the big bucks. This car has potential to be restored correctly but to start at $49,500 or higher is too high in my opinion. However, whomever owns the car may be dismayed with the project and it may sell for less that it sold for in Dallas. I have seen that happen.
I sold a 1969 Impala SS 427 at Mecum, see link:
1969 Chevrolet Impala SS for Sale at Auction - Mecum Auctions. After I sold the car it went to another auction a few months later in the Carolinas and sold for less than what I sold it for. Then a year later it sold at Barrett-Jackson Palm Beach for less than the prior auction. The guy that bought the car was a phone bidder from Grand rapids Michigan and he called me before the car went through the auction block (found me through the internet) and asked me about the car. He ended up buying the car for $29,000. Then he did some trans work and other minor fixes ( which weren't needed when I sold the car) and sold it through a dealer in Michigan( see link) :
1969 Chevrolet Impala.
So it is amazing how many times a car can be sold in a short period. I keep my cars for many years before I have to sell to buy another