Hello JA Customer,
Unfortunately if you do not have copies of your own returns or if your CPA does not have copies going back that far, there is no other source where this information is still available. The IRS is required by law to destroy all tax records that are more than 7 years old. So the oldest returns you could still get from the IRS would be from the year 2003.
I am sorry that I could not give you other options here, but there are just no other agencies that would have copies of your tax returns. I hope this at least answers your questions so you do not continue to search for other options which simply are not available.
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Thank you JA Customer