I've created this box and the texture. It ogt a full psd file, with the layers the text, the box and the dark corners. It is a 1024 x 1024 texture. I've also added png files with and without dark corners in 1024 x 1024 + 512 x 512 files.
It is three models. One with no corners around the box. And two with corners, one low quality (156 polies), one high quality (332 polies).