Unusual Microsoft CSP Delivery Question

Dear Community,

One of my customers has encountered a reseller offering 'non-assignable' CSP licenses (Office LTSC Standard 2024), claiming they are provided as new licenses through the official CSP distribution channel.

However, the licenses are not assigned to the customer's existing tenant account, and the software is not accessed or managed via the Microsoft 365 Admin Center. 

What is delivered:

• A PDF file containing the product key (unverifiable via VAMT; no results returned)
• An ISO installation file for Office LTSC 2024 Standard, provided via a link to the seller's SharePoint storage
• Screenshots from the seller's M365 Admin Center profile displaying a 'billing account' allegedly associated with the customer. However, the billing account type is not specified
• A message sent to the customer from email address removed for privacy reasons stating: "Your organization has accepted the Microsoft Customer Agreement". 
• No credentials to the Microsoft tenant are provided to the customer

This setup appears suspicious for obvious reasons, and I would appreciate a second opinion. 

Question: Is it even possible to deliver CSP licenses to a specific customer without granting them access to the Microsoft 365 Admin Center?