What Would You Do with a Sealed, 1st Press Miles Davis "Kind of Blue"?

If this is a truly sealed album then you need to ask yourself if you want to sell it to make the money. If it does not sell for what you want then open it and have it cleaned and play it. I do not like that it is already has mold and it will be left there because of the monetary value. I also agree with others that if the outside cover is not sealed it is not of a NM grade. Also I have read that albums get warped due to staying in the shrink wrap too long. 

My mono "Kind of Blue" has that limp plastic inner liner as you described.  What you have is an original release.  If the side 2 track listing had been incorrectly inverted, that would make it an early pressing in the run before they corrected the jacket (mine is that way).  

I have no idea of the collector value of a record with an unbroken inner seal, but, if you are concerned with mold, it might make sense to open the record and clean it thoroughly.  Columbia was a big label that put out a large number of records for each release, so the original "Kind of Blue" is not extremely rare.

4th lacquer from 1st master tape according to discogs. 

Try to find a sucker to pay you far, far too much for it.  P.T. Barnum was right you know.

I would invite a few friends over who can truly appreciate it, and listen to a piece of history. Ask them to bring over a few bottles of a 59 Bordeaux.

Sadly I am all out of 59s, but it takes a discerning palate to appreciate that the 59s are often better than the highly touted 61s. Wonder if the same holds true for LPs......  ;-)