Are postgresql 8.2.1 RPMs signed?

Hi,
Do you know if 8.2.1 RPMs provided at:
http://www.postgresql.org/ftp/binary/v8.2.1/linux/rpms/
are supposed to be signed by PGP Key
(http://www.gunduz.org/devrimgunduz.pgp.pub)?

At least it seems that this is not the case for redhat/rhel-es-4:
[root@node0]# rpm --checksig -v postgresql-server-8.2.1-1PGDG.i686.rpm
postgresql-server-8.2.1-1PGDG.i686.rpm:
    Header SHA1 digest: OK (de3bf048ed25c4e9c441d57930ae3cd4cd461d42)
    MD5 digest: OK (8ec032ce026c736c8fa80bea9124a6cc)
thanks
Mathieu