Whole wagons were not found. The hoard held broken parts.
Known. Those parts are the first clear sign in Britain of large four-wheeled wagons.
The hoards are at Melsonby, in North Yorkshire, England. They date to between 40 BC and AD 40. Nearly 950 objects were found, less than a kilometre from the Iron Age centre of Stanwick. One deposit held 28 bent iron wheel tyres, horse harness, weapons, and a lidded bowl with face masks and coral. The page says the parts match wagons from Dejbjerg in Denmark, and point to at least seven large four-wheeled vehicles. No human bones were found with the metal.
The page only suggests that the wagons were smashed for a rite or a show of power.
https://www.ancient-origins.net/news-history-archaeology/melsonby-iron-age-hoard-00102612