It you have problems, (head gasket etc) they will show up in short order.
If you or driving with no probs, then you are most likely fine.
If it got that hot you would know. (Ie detonation or loss of power)
Check oil for a milky tinge, or a creamy goo in the oil cap, indicating coolant in the oil.
also in the radiator indicating oil in the coolant.
bubbles in the puke tank indicate compression in the cooling system.