Hi @PmcT77
Apologies for the delayed response.
Unfortunately, since you didn't have diagnostics configured for Azure Monitor, there isn't a way for you to access this information. You can, however, create an Azure support request requesting a support engineer to retrieve this information for you. Depending on how long ago the backup was done, a support engineer should be able to assist. Timing will be important though as I believe there is a retention period for such logs before they are purged.
EDIT 15 Nov 2023 I've received confirmation that the details of files restored is not exposed. I've confirmed the product group is aware of this ask. However, I don't have any additional on if or when this feature request will receive work. Should that change, I'll update this post.