Hey dude,
I am on Windows. Checking the basics can be done just by right-clicking and going to properties obviously. However, the way I tell is by loading it up in iZotope RX10. In this program, you can clearly see whether the file was once an MP3. As far as I know, there is no way of finding out an exact history of a file and what it has been through, and what it has been converted with, encoding history, etc, but I see all the information I need to make a judgment in RX10. To be honest, after being a mastering and mix engineer for over 35 years, I can hear it in the file lol. I am not sure if that is good or bad.