2014 timecutter Toro SS4235 42" 24 hp V twin zero turn

I know a company that is selling the 2014 lawnmower. The lawnmower has only been used once then left outside for 10 years. They are taking silent bids for it. The battery is dead and tires are flat. They are selling as is so no starting it. What would be the problem with the engine and or the hydrostatic drive when sitting so long without being started? They want a minimum of $775. Is it worth taking the gamble?
 
Thank you