> Congratulations but I can't find a mirror with the release....
Did you read the entire message, in that was:
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1) Read either of the following two files for a list of ftp
mirrors which provide OpenBSD, then choose one near you:
http://www.OpenBSD.org/ftp.html
ftp://ftp.OpenBSD.org/pub/OpenBSD/4.7/ftplist
As of May 19, 2010, the following ftp mirror sites have the 4.7 release:
ftp://ftp.eu.openbsd.org/pub/OpenBSD/4.7/ Stockholm, Sweden
ftp://ftp.bytemine.net/pub/OpenBSD/4.7/ Oldenburg, Germany
ftp://mirror.aarnet.edu.au/pub/OpenBSD/4.7/ Brisbane, Australia
ftp://ftp.wu-wien.ac.at/pub/OpenBSD/4.7/ Vienna, Austria
ftp://ftp.usa.openbsd.org/pub/OpenBSD/4.7/ CO, USA
ftp://ftp5.usa.openbsd.org/pub/OpenBSD/4.7/ CA, USA
ftp://obsd.cec.mtu.edu/pub/OpenBSD/4.7/ Michigan, USA
The release is also available at the master site:
ftp://ftp.openbsd.org/pub/OpenBSD/4.7/ Alberta, Canada
However it is strongly suggested you use a mirror.
Other mirror sites may take a day or two to update.
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so I find it somewhat difficult to believe you could not find a mirror.
Perhaps OpenBSD is not for you.