I can't wait to see the pictures, Carl.
I have a feeling it would have been safe to bid quite a bit higher. There is a chance that these trees are much more valuable to him than nursery trees ever would be. These are HIS trees.
Cool either way! I hope it works out well for you, him, and the trees.
love
nick
ps- I was recently taught by someone in the LA Urban Forestry Division that caliper is measured 6" above the trunk. I wish this was more consistent!