the files in the tar archives are from
nyftp.netbsd.org:/ftp/pub/NetBSD-daily/netbsd-6-0/201302082310Z

The reference point is nyftp.netbsd.org:/ftp/pub/NetBSD-daily/HEAD/201302130710Z
for all arches but sparc; sparc references
nyftp.netbsd.org:/ftp/pub/NetBSD-daily/HEAD/201302151610Z