You can go to Support.dell.com enter your service Tag  Click on overview and view specs.  Now you can find the factory shipped OS from Dell    [IMAGE]     You are probably right, Amazon sellers do modify the computer for the deal to look more attractive.  I would also suggest comparing RAM, SSD with the factory specs as well.  In case of future hardware failures Dell would only cover what they build, if seller has added anything in the machine you will have to contact him, 
Hi,  I have Dell Inspiron 3880 which shipped with Windows 10 Pro OEM license from Dell.  I just did a clean install to Windows 11 from the Microsoft-provided USB media creation tool.  During installation there was no option to select an edition, Pro or Home.  After OS installation finished it shows that it installed Windows 11 HOME, not Pro.  I understand that this might have something to do with the license saved in the UEFI, but this computer shipped with Pro, not Home.  How do I get it to install Windows 11 PRO?  Thanks.  
Inspiron 3880 with Windows 10 Pro OEM license upgrades to Windows 11 HOME