Pretty good, I think; Phil based this on his time in South Asia, where you get layers and layers of forgotten civilizations lying around. See also Catherwood's accounts of his 'discovery' of the Mayan cities, or the wonderful book "The Road To Ubar" where the modern explorers pretty much trip over the 'lost city'. Usually, the locals are quite aware of the location, as they've been fooling around in the ruins picking up goodies and using the stonework for their own buildings. The ruined city of Amarna, which Phil was very familiar with, has a name in Arabic that means "place where things are picked up".
In Phil's experience, there was always somebody still worshipping at the 'lost temple'; during his visit to Egypt in the early 1960s, he noticed that somebody was still laying offerings of flowers on the altars of the gods in the ruined temples, despite centuries of Islamic worship in the same area. (As he put it, "somebody is hedging their bets.") He was of the opinion that the locals would notice any looting or exploration pretty quickly - teenagers - and so we always made sure to make gifts to the local villagers (if any, admittedly) before we went into any ruins.
Tombs are a little different; these can indeed be completely forgotten, as with Tutankhamun's. Again, propitiate the locals before you dig; they will have a pretty good idea of what your up to - teenagers, again - and so being polite is always a good idea, as they may very well have opinions on casual looting going on in their locale.
In short, get to the locals quickly, as they'll be aware of what you're up to just as quickly. And, they are also very helpful sources of information and assistance, if treated properly. (Does not apply to Milumaniya, where all they want to do is eat you.)
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