How to find Folder ID of an account (for custom integration)

Hello - I have a custom integration that scans the Sent folder of a processor’s account for a completed document and moves it to another custom folder.

If I click the custom folder, it shows the folder ID in the URL: https://apps.docusign.com/send/documents?folder={folderID}.  However for the Sent folder, it only shows https://apps.docusign.com/send/documents?view=sent

Years ago the URL showed as it does with the custom folder with the folder ID, but now it now longer does.  How do I find the folder ID of the Sent folder?  I am switching accounts to a new processor so I need to find the corresponding Sent folder for this new account.  Thank you for your help!