Sorry to be responding late to this party, but I just came across it. I can't say for certain that the rifle in question did not belong to the O'Connor's, but if it did, it is not one that they used much, if any. I did not see any reference in the ad stating that it was Eleanor's rifle, though I might have missed it.
The photos posted by roundoak show the two rifles that Eleanor used for most of her hunting life. I made both photos when I had the rifles at my house. Buck Buckner brought them by on a visit and allowed me to quickly photograph them. She used the Burgess/Leonard 7x57 for the vast majority of her hunting. The other rifle, a .30-06, was made for her by Len Brownell . She used it on a couple tigers in India and at least one elephant in Africa that I am aware of. She didn't use it often as she thought it was too heavy and kicked too hard.
TT
