Sunday night's Ed Sheeran concert at Mt Smart prevented Warriors staff from gaining access to the club's headquarters to store playing gear and other equipment, including GPS trackers and game jerseys, after returning from Canberra.
They were forced to temporarily stash it away in an unmarked van outside a staff member's home on Auckland's North Shore, where it was pillaged overnight.
Warriors CEO Cameron George said they were "devastated" by the turn of events.