[boomboomsubban]

>Going a bit further, once an object has been confirmed as alien, then it's not really "Unidentified" anymore, now is it?

Somehow confirming that it is not from Earth doesn't identify it. There are multiple types of flying objects, like planes and missiles, and could be multiple different aliens groups it could be from.

[zepto]

Also, how does one identify it as ‘alien’? It could be sent by humans from the future, or by “the first men”.