Windows 10: I had to hard reset my PC and lost my product key for Windows 10 Pro

So my computer crashed and I couldn't get anything to work so I had to wipe it. I bought a physical usb version of Windows 10 pro quite a few years back. I still have the box the usb came in. I couldn't find any 25 character keys anywhere on it or in it, so I'm assuming it came on a slip of paper inside the box or something. I've had tried all kinds of different things to activate it and nothing is working. I've been running on an unactivated version of Windows 10 Pro now for quite a while. Thanks.

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Lost Windows Activation Product Key

I recently lost my Windows 10 pro Activation product key and now Microsoft wants me to activate my windows but now i dnt have any product key please suggest me the way i dnt want to lost my all data...

 

How to recover lost Microsoft Office 2013 Product Key after Windows 10 Reset PC

Although the Windows Lost Product Key question has been asked before, this is slightly different.
I did 'Reset this PC' from Windows 10 Recovery without taking a backup of the system or files. All my files were safe but the Licensed Microsoft Office 2013 was removed. I have unfortunately misplaced the MS Office 2013 Student and Home product box. I have also checked with Windows Helpdesk if any of my emails are associated with the MS Office and the Microsoft Account; sadly, none are.

I read that that the 'Reset' cleans the registry and removes the apps. I am thinking of two ways to try and find the key

1. Use all the Free Key finders around then buy a paid one if they don't work
   
2. Use Recuva or a similar tool to try and recover the deleted old Windows Registry files
   

Has anyone faced a similar issue or can you think of an alternate way to try and get the Key?

 

Lost digital product and activation (Windows 10 Pro

I was on Free upgrade of Windows 10 Pro. My compute crashed and I lost all information on my PC as I had to format the hard drive. Now I cannot reload Windows 10 Pro because I don't have product and activation key. I downloaded Windows 10 Pro from Microsoft
website with the running this beautiful system. It needs product key. What do I do