Murphy said the online auction will be held Aug. 28-Sept. 15.
Murphy, a college student, was traveling with a companion to Australia when they stopped at a Giants game. He said they nearly missed the historic at-bat while purchasing a crab-cake sandwich.
"We were back just in time," Murphy said. "We hustled. The ball took a lucky bounce. The scramble for the ball was the longest minute of my life. I think one gentleman kicked me in the back of the head. There were people on top of people, which I didn't really understand. The San Francisco Police Department really helped me out by getting there quickly."
Sotheby's and SCP Auctions sold Bonds' home run ball No. 700 for $102,000 on June 10, 2005. Last August Bonds' 715th home run ball, making him second on the all-time home run list surpassing Babe Ruth, sold for $220,100 at auction.