"It wasn't really as dangerous as it sounds, " says Ms. Sinberg, who manages risk and insurance for the Seminole Tribe of Florida, owners of the HardRockCafe chain.
Julien's Auctions, who organised the Icons of Music sale at New York's HardRockCafe, said it included the largest selection of U2 memorabilia ever made available to collectors.
The musician, who is the first member of the rock band to receive the pavement plaque, will be honoured at a ceremony in front of the HardRockCafe on Hollywood Boulevard on 10 July.