What Gene meant was that only 6 have had any lead in at all since GPI bought Paulson.
Even that content was only something like 47 parts per million. Not enough to notice any weight difference.
However, if you compare a recent Paulson chip with one from 10 years ago, most are about a gram lighter.
Hard Rock & Palms only weigh 8 grams now.

Interestingly though, the recent Harrahs $1's weigh 10g, heavier than they ever used to be. I was tempted to bust one open and look for clues