If you have access to an installed/working version on another computer, there are software programs that can tell what the registration/serial numbers are.
10 Software to Recover Product Key Licenses from Computer
https://www.raymond.cc/blog/retrieve-serial-numbers-or-cd-keys-from-your-computer/
Or you can just search duck duck for “Office ‘95 serial number” and I am sure you will find a working one. it is one of those programs you can install as many times as you want.