The EIN's for those entities do not need to be reported anywhere within the form 1120-S tax return.
It is recommend that you include a statement with the final LLC tax return explaining the transaction and that the entity will continue as a single-member LLC under the EIN of the S corporation member.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
