I did something similar to a piece of stainless steel a couple of months back, I bought a cheap abrasive blaster from Harbor Freight. Worked reasonably well for a small piece (table lamp)
You’ll have to experiment with what media you’re shooting out walnut shell, glass bead, or aluminum oxide. I had the best luck with fine grit aluminum oxide media.
If you’re using stainless it’s not going to look exactly like the Apple finish though because aluminum is a whiter metal.