I recently pulled the trigger on a pair of sweet proof sets I've put off buying for years, a 1955 and 1956 set.  While there I saw a 1962 proof envelope marked, "never opened", it was reasonably priced. My sceptical nature immediately rose to the forefront, my question to all of you; how do we know it has never been opened?  If opened, then resealed, how do you know the coins are legit?  It's not hard to reseal an envelope if you are careful.  Finally, if this has truly never been opened, how neat is it that a 58 year proof set is unopened?  Just wondering what the rest of you thought about this, is this unusual?  

Could this set contain a valuable coin, never exposed?  Finally, if you purchased this set would you save it for the 100 year anniversary unopened?

I personally have never heard of this... an "unopened" envelope.  I, being a super curious person by nature, would buy it just as a oddity.  I have to admit... Under my numismatic care, said envelope would most definitely not remain unopened for very long.  But it would be super interesting to see what was inside.  It really just depends on your personality.  Even if I do not break even with my investment into it, I would probably conclude that the extra money was well worth the fun of wondering what is inside, and eventually finding out (as well as see when my self control utterly crumples).  

Well as I see it there is no such thing as never searched or never opened. I just don't trust people. The seller may never have opened it but someone did. I wouldn't be around for the 100 year mark so open it up says I. I guess I have a bad attitude. It is nice when I am proven wrong. You see stuff like that all the time. Especially at shows. So, did you buy it??

I'm also very untrusting, so no, but the idea is killing me, I may have to buy the darn thing, then.....open or save, wow see, I just don't know.

I own every proof set back to 1955, three of which are still sealed. My thoughts are that if the flap looks smooth with the main envelope I'd say it's never been opened. By the way, is that '55 a flat pack or box set? I have both. The boxed set being one of the afore mentioned still sealed with the brown tape.

Pretty cool. I have never seen the word "unopened" from a dealer. Either he is dishonest or he has taken the coins out of the flimsy plastic film, like many people have done. 

First of all...nice finds!    That sounds very intriguing for sure!   "Never opened", maybe?  Reminds me when someone says a roll of coins has never been searched through...   haha    It's pretty cool though...If your still thinking about it, you may just have to bite the bullet.    ; )

I've seen them advertised. So they must exist out there in the wiod

@I. R. Bama
I've seen them advertised. So they must exist out there in the wild 

So, proof sets can go for more when they are still in the plastic mint packaging. But because envelopes can be resealed, I don't think they can carry any bonus. I think the value is solely in the coins. I would have opened the envelope up, because if you don't you can't even admire the coin! What use is that? I buy my coins to look at them and admire the history, but that is just my thoughts