Seems like
<Mapping ArtAssetID="box_im_center_silver" FileName="box_im_center_silver.tga" />
and here are the IM buttons:
<Mapping ArtAssetID="im_button_normal" FileName="im_button_normal.tga" />
<Mapping ArtAssetID="im_button_close_highlight_active" FileName="im_button_close_highlight_active.tga" />
<Mapping ArtAssetID="im_button_pressed" FileName="im_button_pressed.tga" />
<Mapping ArtAssetID="im_button_rollover" FileName="im_button_rollover.tga" />
<Mapping ArtAssetID="im_button_ghosted" FileName="im_button_ghosted.tga" />
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