Well I'm about tired of that excuse that the DNA is from the Hoopa Tribe. They do have the sequence cataloged somewhere because The U.S. government recognizes the tribe. In order to claim to be a member of the tribe to receive any benefits you have to have your DNA parentage tested and compared to establish yourself as a member of the tribe if the geneology is not clear.
http://www.hoopa-nsn.gov/documents/Hoopa%20Enrollment%20Packet.pdf
As for GenBank, They don't store the sequences as one intact genome but as different identified segments in different files for comparison. This info is from 2001, I'm sure the library is much larger now.
A portion of human DNA is stored in the PRI division, which contains (as of this writing) 13 library files, for a total of almost 3.5 GB of data. Human data is also stored in the STS, GSS, HTGS, and HTC divisions. Human data alone in GenBank makes up almost 5 million record entries with over 8 trillion bases of sequence.
http://oreilly.com/catalog/begperlbio/chapter/ch10.html