I actually contacted dave long before the auction ended but I guess your offer ( though less ) was sweeter....:o)
I went thru the same holdingmybreath process when I bought my 4345's and they also needed a lot of work. Unfortunately I had to sell them due to family illness but I was hoping for these to get that feeling back..
You will find the 10 *really* needs to be the foam surround 2121 or 2122 for the cabinet to work correctly. The 2123 cannot be tamed with network tweaks or level control without a lot of work.
Any competent JBL reconer can add the mass ring to the 2234 to make it a 2235.
Networks that old should be removed and saved for resale and a nice pair of new ones built aka giskard/style for the best listening.