the last update unfortunately deleted those two files, which
makes the instructions hard to follow.

on our running system, we've got the following in /rc/bin/service.auth:

/rc/bin/service.auth/il566:
	#!/bin/rc
	/bin/auth/auth.srv -d $3
/rc/bin/service.auth/tcp567
	#!/bin/rc
	/bin/auth/auth.srv -d $3

make sure to chmod a+rx so that they're executable.