I lost my dad's buffalo penny
Let's ask your dad and see how he's going to react.
I think he will make me pay for losing it.
When handling someone's possession, it is expected that you will take care of it and not lose it. If you lost your father's collectible coin, you should find a way to pay him back for the loss that he incurred as it is only fair.
My dad should just let it go.
Do you remember where you might have lost it at? If you can't afford to replace it you should get looking.