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Message:: [QUOTE="Conder101, post: 157813, member: 66"]Sets from 1968 to 1998 usually can't be opened without being able to detect the tampering.  With the introduction of the state quarters in 1999 they changed the proof sets and stopped sealing them closed.  All of the sets from 1999 to date can be easily opened and closed with no evidence of tampering.  this led to some scams in 1999 and 2000.  In 1999 there was a "rash" of error proof sets being sold on eBay and bringing big money.  They all were missing one of the state quarters and had two of one of them.  These set clad sets were selling for $300 or more.  But all you had to do was buy five regular sets, open them, rearrange the quarters, close the sets and sell them for big bucks. The second scam appeared in 2000 when some "Extremely rare ten piece 1999 proof sets" began showing up on eBay. The 1999 Proof SBA came out too late in the year to be included in the proofsets.  But the sellers claim these were some special VIP sets made up for special presentations.  What they really were were 2000 sets that had been opened and the coins replaced with 1999 coins including the SBA and then closed again.  (The inserts on the 1999 sets were a different color though than the inserts used for 2000 sets making these easy to spot if you knew what you were looking at.)  These also sold for big bucks.[/QUOTE]