If they have no stealable items, it will be indicated by three lines (—).

So, overall, you will have plenty of easy ways to get your hands on the Steal Materia!

Yuffie holding up a piece of Yellow Materia while winking at the camera in Final Fantasy 7 Rebirth

Rhonda from the Under Junon region in Final Fantasy 7 Rebirth

An images showcasing the Steal Materia available for purchase via a Vending Machine for 500 Gil in Final Fantasy 7 Rebirth

An images showcasing Cloud with a Maxed Out Steal Materia equipped, giving access to Steal and Mug in combat in Final Fantasy 7 Rebirth

Kyrie from Final Fantasy 7 Rebirth, giving Cloud and company another quest to complete.

Triple-A Games

Final Fantasy 7 Rebirth