I have been going to this show every Spring for several years. There are usually somewhere around 30-50 Spencers for sale. I did not keep records like you did, but this year I was looking for post-war models (1865, 1867, NM) and only saw a couple of those. I believe I also saw one Burnside carbine modified to rifle. Other than that they all seemed to be 1860 rifles and carbines with a fairly high proportion of rifles. One for sale rack had several "identified" 1860 rifles. I did not attempt to verify whether they were in the Springfield Research lists or identified in some other way as they were all far above my price range and too difficult to get out of the rack (possibly by design). As always it was a very enjoyable show.
--DJ