Hi, I'm Bhavik. Welcome to JustAnswer. I'm reviewing your question now, and will reply back ASAP.
Generally auto saves are stored in the same location where you original document is saved unless you explicitly specify the location.
You can also do a search in your computer for .abk file and find the location where it is present.
Which operating system do you use ?
Oh, You must have received automated notification. You can ignore that. Please tell me which OS do you use in your computer? Is it windows ? Windows 10 ?
You can search for Ext:.abk in the search Box.
Were you able to find your missing files ?