My original iTunes library

Many moons ago when iTunes did one thing and did it extremely well, I ripped all of my purchased CD's (of which there were many) into my iTunes library. From there I could load them up onto my iPod or iPhone as I chose and off I went on my merry musical way.

Then one day when the internet became more of a thing and connections a **** of a lot better, Apple offered me the ability to stream millions of songs and albums for a modest amount of money every month. Sounded good so I signed up! Then Apple said that I could upload my entire library as well so that I could experience both features at the same time on any device that I owned. Given that I have numerous gadgets this was appealing.

So my apolgies for the long pre-amble, now for the question, is there a way to show in iTunes what were the original CDA files that were in my library and what is part of Apple's catalogue?

The idea of 'factory resetting' everything and loading up all of those original files does not fill me with joy.

Many thanks in advance, David.