The picture is more or less self-explanatory but perhaps we should at least note the deluxe (facing us) is on one side, hooked up to one speaker cab, and the boogie is on the other, no doubt hooked up to the other speaker cab. You can hear him switch between the two amps, or rather, you can hear the difference between them quite easily, even if you don't know how to pick up on the sound of each amp: the deluxe is more center panned, or it may be that it is double mic'd and panned hard, left and right, in the mix, but either way it's simply louder and more present in the mix; whereas the boogie is panned hard right and somewhat quieter in the mix. Also, Trey's clearly only using one channel on the deluxe.
(http://i244.photobucket.com/albums/gg29/cactuskeeb/ph_10_15_2010.jpg)
Sneaky little ginger.