Schrödinger's Mailbox

 I realized today my mailbox is in an indeterminate state until I check to see if mail has been delivered.  It's an either/or state:  there is mail, or there isn't.  But until I check I don't know if it has come yet, or if it is still to come.  Is the box full?  Or still empty?  Has the mail come?  Or is it still to come?  Until I open the box, both states potentially exist at once.

This has nothing to do at all with Schrödinger's famous thought experiment.  But it's the way most people misunderstand it. so I figure I'm on solid ground.  Somewhere.