how much can they cost? and look here http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=41111&item=3925362997&rd=1
Well the sets offered are dated 1961, 1962, 1963, 1964 only. The highest value of any is the 1963 with a dealer bid of $11.50 At $16.99 plus shipping, I would sell them by the truckload. The other three dates are roughly $8 to $9 each. Not a good deal at all.
There's a lot of hype in the title of that auction. "Unopened", "Sealed", "Never Opened-Could Contain DCAM Coins Worth Thousands". These are what experienced eBay buyers call "red flags". Honest sellers know that coins sell themselves. There's no need to hype them. Also, this is another "grab bag" type auction. Nowhere does it say exactly what you will get for your money, only what you "could" get. That's a BIG red flag. You can buy these sets for for less than $16.99 + $3.00 S&H all day long. One other note... The people I have talked to, that bought boxes of proof sets fom the Mint in the 1960's, say that the envelopes, inside the boxes, were not sealed to begin with. It's no problem to take the coins out, make sure there are no "DCAM Coins Worth Thousands", put them back in the envelope, lick the glue, seal the envelope, and advertise it as an "Unopened" proof set. Don't fall for this kind of hyped-up advertising, Vlad. It is clearly aimed at newbies, and is intended to separate them from their money.