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The IRS Form CP575 is the IRS generated letter you received from the IRS granting your Employer Identification Number.
Here is an example of that letter
For copy you need contact IRS via the phone. Call _1_800_829_4933_ from 7:00 am to 10:00 pm.
You need to be an authorized person to request a letter for the corporation.
Actually - the IRS will not re-issue or provide a copy of the CP575 Letter.
If you lost your original letter and need to confirm your EIN - the IRS will send you the letter 147C that may be used when you are asked for the CP575 Letter.
Please let me know if you still need any clarification.