If he didn't do it via water displacement, all bets are off.
Just fror grins I went to mcmaster.com to see what they have for lead...
Lead shot, .080" dia, wish it was smaller:
about $38 for five pounds.
about $34 for five pounds
6X6 and 12X12 sheets available, various thicknesses.
No reason to look any further. Don't lick your fingers before washing.