20 C.F.R. § 655.452
If the TLC is granted, the CO will send a Final Determination notice and a copy of the certified CW-1 Application for Temporary Employment Certification to the employer and a copy, if applicable, to the employer's agent or attorney using an electronic method(s) designated by the OFLC Administrator. For employers permitted to file by mail as set forth in § 655.420(c) , the CO will send the Final Determination notice and a copy of the certified CW-1 Application for Temporary Employment Certification by first class mail. The CO will send the certified CW-1 Application for Temporary Employment Certification, including approved modifications, on behalf of the employer, directly to USCIS using an electronic method(s) designated by the OFLC Administrator. The employer must retain a copy of the certified CW-1 Application for Temporary Employment Certification, including the original signed Appendix C, as required by § 655.456 .
20 C.F.R. §655.452