Well, let's try to think about why inexplicable finds are hidden from us so quickly and thoroughly. I will give here 6 conjectures why they can still be hidden.
Conjecture 1
Scientists need to somehow give their comment and explain the find. They can't say that they have no idea how this can be done. Therefore, if the find is difficult to explain, it is easier to remain silent about it.
Conjecture 2
To preserve the generally accepted order and religion. If we were told that 2 alien mother ships were found in Antarctica, and they are now in the hands of the Americans, what would be the reaction?
Therefore, some things are hidden to maintain peace and order.
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Conjecture 3
Some things, such as finds that are several million years old, are often plundered. They were not particularly classified, but someone simply kidnapped them into their private collection.
Such a kidnapping can be compared to concealment, because it seems that there was a find, but it seems not.
Conjecture 4
You can also add universal security. God forbid, if a powerful alien weapon or ancient civilization falls into the wrong hands. Such an oversight can lead to the collapse of our entire civilization.
Conjecture 5
Some states may deliberately hide some finds, in the hope of obtaining sacred knowledge or technology. After all, no one wants to share secret technologies and knowledge.
Conjecture 6
There may be a certain group of people who know the whole truth about the earth and humanity, and deliberately hide the whole truth. Why and why is hard to say, but we can hope that for our benefit.
Well, I think that's enough, as you can see, there are just a lot of reasons for hiding everything interesting. Therefore, the most unusual finds will be kept in the strictest secrecy to the last. Remember zone 51, only recently the US announced that it existed at all.