i did not say it began to adapt, nor did i mention that it should start adapting by that time
i was referring to the amount of data points you could acquire from human jaw bones between the present and 3,000 years back and what you could do with them. you say there is no evidence? i give you human skull from a murdered dude last week, a human skull from medieval graveyards, a human skull from Egyptian Pharaohs, A human skull from Phonecian grave yards, a human skull from Greek graveyards, and so on. from all of these you could measure and collect jaw bone data and model it. you may actually be able to see differences within the 3,000 year time frame and you could model human jaw bones from previous times where there are no remains.
from the jaw bone, both real and modeled you could collect varying types of data, such as what types of food they ate.