I'll always ship anything. The 50 miles would be about 3 drag passes, and driving to the track, and then to the shop from my house. Two of them were used for 2 passes on a fwd car but were not really worn or anything so they have a extra 20 miles on them, not burned out like crazy etc just simply put on to try and see how they would react as a street tire.
I should get a pic of the tread depth as its not a lot (disclaimer) but I bet these would last a street car a good summer of driving.
And I know the question is likely going to come up, I'd rather not sell the wheels as I LOVE them on the BG car, but if someone wanted the set complete I'd do $600 firm there are only a couple minor flaws in the wheels, no curbs etc.