Whatever he's holding in his hand, AFAICT it's a disk. There MIGHT, and I say MIGHT be some sort of cross design on it. I've considered the colouring and believe it's consistent with areas on the white pad on the underside of the copier's lid. Areas that would be consistent with dents, wrinkles etc basically a physical element that produces shadows. So there's a chance that there is a cross design there, something anyway that's causing, what I think, is a shadow.
invert.jpg
I'm also not unconvinced that, that's not a bullet at the bottom between the glasses and the coin. I don't know. There's plenty can be read into the composition in regards Zodiac allusions. Stine being one but Berryessa is also there with the sunglasses, keys, money even the comb as these were elements in that crime even down to what was reported in the papers re his hair. The ring for LHR. If it is a bullet then maybe that's BRS. Or the 'B' on the billfold is arranged to represent 'B'RS. Even the IV tube with it's "life draining into an uncertain death". Ahhh art, does it ever stop giving? lol.
The 'disc' thing in his hand would most likely be a hospital object? Something with a cross design, maybe even in a circle, denoting 'medical'?
EDIT: Hypothetically if it is a disc with a cross symbol, and, as Ent says, nothing in his collages is accidental, then the Zodiac interpretation of that could be. The Button Badge that never was, at least not during his 'time'.