Edited my virgin sample onto the report.
Lead is left over from last track day, since only 9qt is removed/added at each oil change. Also I can smell the leaded fuels for a long time after as the tank mixes.
Purchased a 6-pack from Walmart and 2 of the 6 have flash/burr from the stamping on the end cap. Looks like the die was dull or didn't make a full depth hit.
Photos from 1 of the 6: