Eric3742 said:
I think this Lenovo laptop is using Corporate version for Windows OS, as up to the buyer to select.

As my repairman told me that he is using this version to install, limit is unknown.
The 2 Laptops Windows OS is not the same as on the laptop stickers.

This is NOT a Volume license - and Volume licenses CANNOT be sold in any case (pre-installed or otherwise) through retail channels.

Your repair shop is either incompetent or fraudulent - take your pick