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True. Provided that:
a) you know what you're looking for
I believe that is a given.
Tsurugib) you look forensically
See above, no thanks to earlier archaeologists.
But you could just find it in one of the other twenty or thirty million such sites. Somehow, I don't think concrete from our time will be looked upon as a curiosity by far future archaeologists.
In 1813 the world 'European' view was that our planet was about 6,000 years old and that men came from a special creation event initiated by God.
2013 we know the world is now billions of years old and the evidence points to a slow evolution and development of culture, language, society etc. We have found a number of civilizations that we didn't know existed in 1813 and scores of cultures.
So I would say there is no failure - but it will take centuries more of effort to find out more about our past, often blocked by religious bigotry, scientific egos, lake of money, lack of technology but we will in the end gain a fair idea of the when and how of our rise.