Hi again, and thanks for your patience.
I've found this for the 1983 Silver Oak, but can't see the size of the bottle in your picture; I'm assuming it's an 'average' sized bottle, like the rest, and is 750ml. These prices are pretty hefty for the 6L 'Imperial' size, as you can see:http://www.wine-searcher.com/find/silver+oak+cabernet+sauvignon/1983/usa
For your 1985 Sequoia Grove Cab Sauv, again, this bottle is most likely larger than yours, but this is the price it is selling at, from this merchant, just to give you an idea:http://www.wine-searcher.com/find/sequoia+grove+cabernet+sauvignon/1985/usa
1985 Kenwood Sonoma Valley Cab Sauv:Kenwood Sonoma Valley Cabernet Sauvignon, Depressed Cork, 1985
The 1986 Peppoli Antinori Chianti Classico is selling for between $30 and $40http://www.winefetch.com/websearch_results.html?winery=ANTINORI+CHIANTI+CLASSICO+PEPPOLI&year=1986
Your 1985 Jordan Cabernet Sauvignon is being sold by a vendor in California for $190:http://www.winefetch.com/websearch_results.html?kw=1985+Jordan+Cabernet+Sauvignon
I couldn't find much information re: price for the 1987 Sebastiani Cab Sauv, except a 'Cherryblock' variety at auction for $18.50.
I think you'll find this interesting re: the value old wines:http://www.thewinedoctor.com/author/valueofoldwine.shtml
The wines you have shouldn't really go 'bad' as long as they have not been exposed to the air and if they are unopened, this is good, but if they have not been stored at the proper temperatures all these years (a little too warm, at times), their quality may have been degraded. Most old wines typically do not increase in value, unless they were a rare vintage at the time of purchase.
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Edited by Cher on 12/26/2010 at 11:26 PM EST