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The CP575 is the notice the IRS issues when you are assigned an EIN. The IRS is unable to re-issue or provide a copy of your CP575 notice. However, if you lost your original notice and need confirmation of your EIN, you can call the IRS business help line at 1-***-***-****. Tell them you cannot find your CP575 and would like a confirmation letter of your EIN.
The IRS will then send you a 147C letter that may be used instead of the CP575 notice. You may send a written request for the letter 147C but it would be faster to call and request on the phone.