The rocker uses the giant props during the band's live gigs so he can shoot laser beams into the crowd but they disappeared after a performance at the Southbound Festival in Busselton, Western Australia.
The musicians took to their Twitter.com page to appeal for information and posted a photo of the giant hands in action, adding, "F**k!!!!!! Someone stole laser hands!!! Please please please!! At South Bound Festival (sic)!!! F**k!! Help us!!!"
Organisers of the festival have also joined the hunt for the band's props, offering four Vip tickets to next year's (14) event to anyone who can return them.
A post on the festival's official Facebook.com page reads, "Please help us and The Flaming Lips out - someone stole their amazing giant laser hands and both we and the Lips desperately want them back.
"We're offering 4 x Vip tickets to Southbound 2014 to the person to gives them back. And any info would be incredibly welcomed!! We've heard whispers from the campsite, so someone knows about it!"