Concert organizers had offered a $10,000 reward for the pig's return. On Tuesday, pieces of the plastic carcass were examined.
"That's definitely our pig," producer Bill Fold said.
Susan Stoltz found a plastic heap in her driveway Monday, but said she didn't know what it was until she read about the missing pig in the Desert Sun newspaper.
"My kids are going to think I'm so cool," she said.
Another resident of the same neighborhood, Judy Rimmer, said she found a piece of the pig draped over a front-yard plant.
The two couples will split the cash reward, Fold said.
As tall as a two-story house and as wide as two school buses, the pig was led from lines held on the ground Sunday as Waters played a version of Pink Floyd's "Pigs" from the 1977 anti-capitalist album "Animals."
Then it just floated away.
"It wasn't really supposed to happen that way. I don't have the details," festival spokeswoman Marcee Rondan said.
The pig displayed the words "Don't be led to the slaughter" and a cartoon of Uncle Sam holding two bloody cleavers. The other side read "Fear builds walls" and the underside read "Obama" with a checked ballot box for Democratic presidential hopeful Barack Obama.