1995 break down
https://parts.olathetoyota.com/1998toyotasupraparts.html
1996 break down
https://parts.olathetoyota.com/1998toyotasupraparts.html
The cassette and everything is all different.
Yeah, the CV grease doesn't usually come out unless the boot is torn.
There isn't that much grease in the ball joint.
I would at least peel the boot back and take a look.
The only other thing I can even think of is the wheel hub, but it sure looks like a typical CV boot failure.