How Did I Do On This?

Well, IMO, you probably paid OK for the note. It is quite common to see these with the corners missing. I have a special serial number that I bought with a corner missing.

The bottom line is - is it what you wanted and are you happy with the note. The rest doesn't matter as much. Many collectors will "over pay" for a note that they want for their collection and it makes them very happy to get it.

I think you did OK perhaps overpaid by a dollar or two. In my opinion estate auctions or small auction houses are the worst places to buy common coins or currency for a reasonable price since amatuers and non-collectors tend to overvalue common items and will bid well past the retail value of the item. At the auctions I go to every once in a while it is not uncommon to see common circulated Morgan dollars selling for $50-$65 dollars a piece. Some auction houses and their consigners buy inexpensive/problem notes from a local coin shop in my area since they tend to be profitable when flipped at small auction houses.