[GeeTwo]

I would start with the school administration. Bring whatever documentation you can to show that the team equipment was purchased with funds raised by the team. Bring a list of items. Start your list with things that are most obviously purchased for/by the team, such as the control system, work your way down through other FRC-specific parts, then tools and more generic stock, and be ready to declare victory and move on if you get partway down the list. If you can't find a school or school board administrator who agrees to your side of the case, your only avenue is probably through legal action, which is likely to cost more than its worth, and is certain to be inconclusive in time for build season, in any event.