I've never heard of it happening. It's only a small sampling of contracts sold, but there are rofr threads for each quarter on the boards you can go through to see what passed and if any were ever taken.
It's always a possibility, but it seems to be rare. I've got a contract in ROFR from an international seller. I'm confident it will pass because it's an international seller and it's a VGF contract.
i always thought they were never taken but A data analyst looked into this and found 10% of all buybacks were International which roughly matches the proportion of international owners and therefore it is very strange that these boards have none. Brokers also advertise international listings as ROFR friendly so I’m now confused lol