/etc/cron.d/tua is in tua 4.3-13.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # This script starts TUA with the appropriate arguments.
# This cron job must run *after* uudemon.day has rotated the logs.
#
26 0 * * * uucp test -x /usr/lib/uucp/tua_run && /usr/lib/uucp/tua_run
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