Questions on mailing an Amended Returns to the IRS and California FTB ....

Must the papers being mailed be stapled? Is a binder clip acceptable?

Intuit's "Electronic Postmark - Certification of Electronic Filing" was printed with the federal return - does this also need to be mailed?

For federal - only the form 1040X has to be signed? There doesn't seem to be any area to sign on the attached 1040.

For California - only form 540 has to be signed? There seems to be no signature required for Schedule X.

California requires attaching a copy of the federal return - does this copy of the federal return need to be signed? If so, does it require a photo copy of the actual signatures on the federal return or can it be wet signed?

Thanks!