This rather intriguing video showed up on Youtube yesterday and appears to answer the question of what ever happened to the Japanese Type 5 Chi-Ri Heavy tank prototype. Sources generally state that the vehicle was either scrapped at Aberdeen Proving Grounds or lost at sea during shipment. If this video is what it says, we may have proof that it did indeed make it to Aberdeen where it was scrapped. The video is said to be from October 4, 1952 and shows a number of vehicles, including several Japanese tanks. Both a Type 4 Chi-To and the Type 5 Chi-Ri are visible. That these vehicles were scrapped rather than preserved is a rather depressing thought.
Here is a screen capture of the Chi-Ri.