wire, nails, and screws. I guess German war production was hard pressed. More of an IED.
What they would do is bury a conventional landmine, then cover it with extra shrapnel scrap pieces, then cover it with dirt. The extra stuff was for a greater range of wound producing damage to soldiers nearby........
While I believe the news account about the 6 ounces of shrapnel after the cremation, etc., I think the photograph accompanying the article is just a file photo of scrap. Why? Numerous, well formed, easily recognized items (screws, cotter pins) instead of the jagged, deformed, misshapen chunks more typical of an item that has been blasted to bits by an internal explosion.