Yes, there are some strange artifacts in there, but the majority does look similar to notched wound-wire fragments. I'm just not sure the Chermanns used notched wire in any of their land mines. Back then most 'splodey stuff was segmented in fairly large chunks - think pineapple grenade. About mid-way through WWII the Nazis developed a heavy sleeve, that looked very much like the pineapple grenade, to be slipped over the sheet-steel can of the potato-masher to provide more fragments instead of relying primarily on the shock wave to do the damage. There's nothing available in a short search indicating they used notched wound wire.
Now, about those fragments looking like notched wound-wire fragments. Using that wood screw (at almost dead center bottom) and the binder clip-looking piece as rough guides of two inches, the fragments seem to be fairly uniformly two to three times as long, making them four to six inches. That's waaay to long for wire-wound fragments, which in modern grenades are about one inch long. (Reducing the length of the guides to one inch just makes things worse.) Also, the wire that is used for wound-wire 'splodey things is actually more like a ribbon than plain round wire.
I have no reason to believe that Sergeant Brown was not wounded by an anti-personnel mine and that he carried shrapnel for the rest of his life. I just have some reason to believe that was is depicted is not WWII German anti-personnel mine shrapnel.
stay safe.