The approval notice may send through either email, fax or mail. This is the process that USCIS will follow through if you include e-mail/fax to be sent approval notice to you. Your representative (either your lawyer or your company personal if represent you directly) will receive original approval notice which is I-797A within a week. USCIS has grace perid of 30 days. Within 30 days if your representative did not receive approval notice in the mail you can have your representative call them and have them investigate it.