Form 4868 is the extension. If you filed it, it will be part of your return. You may have marked that you wanted to file an extension but never completed the mission. An easy way to do an extension, is to simply make a payment with the IRS and mark that it is for the extension. That creates an automatic extension with no paperwork needed. Did you make a payment online rather than filing? If you coded it correctly, that would serve as proof. You can check your online account for payments made to the IRS.
See:
Payments
View Your Account Information
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