How to finish mitre joints?

It might be good workmanship, but it is really good luck that 3 of my 4 joints on my first ever mitre box are nice sharp, almost right angles. I suppose 3 out of 4 ain't bad :)



I don't recall ever handling a box with sharp corners, and wonder the best way to finish the joints i.e., by sanding, or with a roundover bit, or by burnishing by drawing a steel rod down the length of the 90 degree corners. Or leave it as is.



I would welcome any ideas and suggestions, thanks