Theyll be spread randomly throughout The Brothers War set boosters, collector boosters, and the bundle box.
The packs look identical to every sealed copy Ive seen available in the past five years _()_/ The stapling of the promos to the piece of paper they were mailed with also lines up - Ive seen several of these packs with staple holes, and unfortunately, have seen a few raw copies of cards with a pin hole or two
Following Fallen Empires codifying a bit more of the 'tribal' synergy, goblins and orcs get a lot more support in Ice Age
Check which format your jumbo cards are before ordering sleeves or display cases
Something along the line of a scannable code on cards to verify authenticity would get the job done, but implementing the program would be costly, and it wouldn't help with all the cards that are currently in print (barring some sort of mass-exchange program, which would be even more prohibitively expensive)