The Linear B tablets from Pylos, which survived precisely because the fire that destroyed the palace baked the clay tablets hard.

Some correspondence from the Hittite archives at Hattusa.

The archaeological evidence is more extensive but also selective in its nature.

We see what survived — the stone walls, the bronze objects, the pottery, the burned destruction layers.

We do not see the wooden structures that burned completely, the organic materials that decomposed, the documents written on perishable materials like leather or papyrus.

The DNA evidence, as remarkable as it is, is even more selective.