The authorities made definitive statements about it. The reason we don’t know is because you don’t trust the authorities. And fair enough, but it means there’s not actually anything reasonable you’d accept as 100% proof, so no this doesn’t tell you anything.
If it was anything other than a conservative, we would 100% have known day 1. The fact that we still don’t know should tell you everything you need
The authorities made definitive statements about it. The reason we don’t know is because you don’t trust the authorities. And fair enough, but it means there’s not actually anything reasonable you’d accept as 100% proof, so no this doesn’t tell you anything.