seems impossible since you should have been getting notices for invalid EIN for years.
suggest these options
1) calling the Business & Specialty Tax Line at 800-829-4933. The hours of operation are 7 a.m. - 7 p.m. local time, Monday through Friday. An assistor will ask you for identifying information and provide the number to you over the telephone, as long as you are a person who is authorized to receive it. Examples of an authorized person include, but are not limited to, a sole proprietor, a partner in a partnership, a corporate officer, a trustee of a trust, or an executor of an estate.
2) apply for a new EIN.
3) look at tax returns besides the 1096/1099s to see if the EIN is the same on all forms
... reviewing iRS transcripts may be of no avail since they usually only show the last 4 digits.
