"Inbox" is not a default folder on the desktop or in standard directories; it may have been accidentally moved from somewhere else.
Help us out here by doing a "Get Info" on that folder.
Select the folder "Inbox," press Command-I (that's "I" as in "Info"), then click all the triangle pointers in the Info pane so they point down, exposing section contents.
Then press Command-Shift-4 and click and drag the curosor over the Info box to take a screenshot of it. The screenshot will be placed on your desktop. Add that screenshot to a reply here by clicking on the camera icon in the reply toolbar and adding the image to the reply.