Greetings,
Your camera does not have internal memory. No images were stored. There is nothing to recover from If you didn't have a memory card installed.
There is an option that keeps the camera from shooting unless a memory card is installed. You can enable this as a safeguard. Camera Menu, Tab 7
https://cam.start.canon/en/C006/manual/html/UG-05_Shooting-1_0340.html
~Rick
Bay Area - CA
~R5 C (1.0.9.1) ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, ~RF 200-800 +RF 1.4x TC, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve Studio ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8 ~CarePaks Are Worth It
