When I bought my mare from a private seller as a three year old, I discovered she had gone through a dispersal sale for broodmares at Ocala OBS. I did a little legwork etc and tracked down some farms, so one day a friend and I drove to Ocala for the day to try to find the farms and see what we could figure out.
Totally expecting to get doors slammed in our faces, every single person at every single farm(we went to four farms) was very accomodating. At the last farm we visited, I actually spoke to the rider who had actually broke and galloped my mare. He was now the manager of the farm, and he actually remembered her, and thought well of her. I had brought a small photo album and showed him several photos of us showing etc and he was thrilled to see that she had a good home and was doing so well.
To top it all off, he stopped what he was doing to dig through some old boxes and found some gorgeous 8x10 glossy photos and stallion information on my mare’s sire, which he gave me.
Here’s the kicker: if anyone does anything extra while you are digging around, be sure and write a thank you note. Thoroughbred farms and people who work there are very busy. People remember things like that and it makes alot of goodwill for those who come after you digging around.
That was many years ago (the mare is still with me and 14 now and I have a filly from her), but every now and then I send him a note and photos, and always hear back from him.
So you have nothing to lose.