I think it's private between the buyer and seller. Why would you need to know who bought what.
It wasn't you, that's what matters in this instance,is it not?
The frame and forks sold on ebay (i think for £700, my memory is often hazy) but it's just been relisted with a starting bid of £200 noting a a couple of dinks in the frame which were not mentioned previously, i suspect it was returned.