Any originals would have went to St. Louis, but there was a big fire there some years back and a lot of the paper documents were destroyed by water and smoke. Once a servicemember's service record is closed out, and he or she has no reserve commitment remaining, the record used to be mailed to the NPRC, where it was converted to microfiche.
I'm sure that with advances in technology, they now store the data in a pdf file or some other scanned media. Anything that comes out of there now, is stamped "official copy", including any DD-214 copies that you might request.
According to the NARA site
On July 12, 1973, a disastrous fire at NPRC (MPR) destroyed approximately 16-18 million Official Military Personnel Files. The affected record collections are described below.
Branch Personnel and Period Affected Estimated Loss
Army Personnel discharged November 1, 1912, to January 1, 1960 80%
Air Force Personnel discharged, September 25, 1947, to January 1, 1964
(with names alphabetically after Hubbard, James E.)
75%
Kerry records would not of been involved in this and should still be available