If none of these work, the file may be permanently lost – but or a cloud backup (Dropbox, iCloud) is your final hope.
~/Documents/Adobe/Adobe Illustrator [Version]/AutoSave/ adobe illustrator recovery file location mac
/private/tmp/ or /private/var/folders/
These files usually have the original name plus _recovered or a timestamp. Illustrator may also write temp files to: If none of these work, the file may