Hi typedan, what version of retropie are you using?

If you are using 2.6 your es_systems.cfg will be located in /etc/emulationstation/ check out this vid if you need help: https://www.youtube.com/watch?v=2WGpGCn9NeI&t=91

Once in, you can find the playstation section and delete the .bin .BIN from between the <extension> tags and they will no longer show up. You can see it in the same video at 1:56.

Another good command in linux is find. Type ‘sudo find / -iname es_systems.cfg’ and it will locate all copies of it for you. Hope this helps!