Are the MU plugins wpmu-assist and gateway-relay required outside of classifieds plugin?

Hi. I'm doing a plugin audit to find the culprit of a plugin conflict and realized that there are several plugins in the MU folder, of which I don't remember why they are there anymore. Was wondering if you guys can help me figure if I can safely delete them from my live production site (they are wpmu plugins).

Both appear to be used solely with the wpmu classifieds plugin, which I believe I must have used at some point in the past, but no longer am.

Is wpmu-assist.php only for the classifieds plugin? I'm not using the classifieds plugin, so am wondering if I can safely delete it from the mu folder.

Likewise, can gateway-relay.php be safely deleted from the mu folder if I'm not using the classifieds plugin?