/usr/share/doc/pyro/examples/callback/ is in pyro-examples 1:3.14-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/pyro/examples/callback/Readme.txt
/usr/share/doc/pyro/examples/callback/b2_client.py
/usr/share/doc/pyro/examples/callback/b2_server.py
/usr/share/doc/pyro/examples/callback/bounce_client.py
/usr/share/doc/pyro/examples/callback/bounce_server.py
/usr/share/doc/pyro/examples/callback/bouncer.py
/usr/share/doc/pyro/examples/callback/bouncer2.py
/usr/share/doc/pyro/examples/callback/bouncer_cberror.py
/usr/share/doc/pyro/examples/callback/cberror_client.py
/usr/share/doc/pyro/examples/callback/shout.py
/usr/share/doc/pyro/examples/callback/shout_client.py
/usr/share/doc/pyro/examples/callback/shout_server.py