I did as you suggested and downloaded the latest 2.5 version of the Storebox template and took that version of the html/com_content folder and replaced it. It had no effect, it's not only the edit link but the print and email icons don't show also. I also tried another Gavick template "Simplicty" and had the same effect.
I've attached some screen shots. One shows the page when I rename the html/com_content file and all the icons show but with out the formatting. The second one is when the html/com_content file on and no icon or links per the Storebox Template are showing.
I've turned on all the icon's in the menu, article manager and the article.