Of course you can 
Watch in the file name UXS-config.ini these 2 lines :
$ELEMENT_11 = 'image|path:image|medias/media_screenshot|path:image'
$ELEMENT_12 = 'image|path:image|medias/media_boxs/media_boxs2d/media_box2d_%%|path:image'
The first one say : "download screenshot"
The second on say : "If you haven't found screenshot download the 2D Box"
If you want only the 2D Box, simply delete the first line and "Renum" all the line to have a continuity in the line order
($ELEMENT_1 -> $ELEMENT_2 -> $ELEMENT_3 -> and so on till the end)
Oh, and if you want screenshot if no 2D box where found, simply inverse these 2 lines ($ELEMENT_11 become $ELEMENT_12 and $ELEMENT_12 become $ELEMENT_11)
Last things, if you want a 3D box instead of 2D box, simply change "media_boxs2d/media_box2d_%%" in "media_boxs3d/media_box3d_%%"
Relaunch UXS and scrape
easy 