The hours of operation are 7 a.m. The only two ways to get an EIN Verification Letter (147C) is to call the IRS at 1-800-829-4933, or to mail the IRS a written request.This EIN confirmation letter is called CP 575, and the IRS only mails the letter to the mailing address listed on line 4 of the SS-4 application. However, you will need Adobe Reader installed if you would like to receive a confirmation letter online. Normal processing time is 10 to 14 business days. This confirmation letter is known as Form CP 575 and is mailed to the address mentioned in your Form SS-4 application. BTExpress will also ask for information such as the Federal Employer Identification. Number (EIN) or Social Security Number (SSN) associated with the Business. Federal ID Number (EIN). Mailing address: Street address of the registering organization: New Jersey Charities Registration number: CH. -00 Telephone number:.