Hi Roy,
The recent Windows Spotlight lock screen images are stored in the following folder:
C:\Users{username}\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_cw5n1h2txyewy\LocalState\Assets
Ref: How to Save Windows 10/11 Spotlight Wallpapers
Copy all the files in that folder to a temp folder on your desktop.
Add the .JPG extension to those files and preview each one. One of them is your current lock screen wallpaper.