I notice 3 wheat-backs staring up at me. Neat-o, I think to myself. A cursory inspection shows two other rolls with obverses that are wheats, from the 20s and 30s (couldn't quite see the last number while they were rolled up).
I considered saving those 5 rolls for a "reward" after I finished sorting the box, but I have little self-restraint for the hand-sorters high of finding wheats, so I cracked them open, one at a time.
Out of 250 cents, got 24 wheats, 14 of them from before 1930! (1919S, 1919D, 2 x1919, 1918, 1916, 3 x 1920, 1927, 2 x 1928, 2 x 1929). I think the highest numi value was only 50 cents from the 1919D, but still quite a thrill to find so many oldies in so few rolls.
Sorry for the poor image quality, I just use my laptop's webcam...but it "sort" of happened!

I'll check back with wheat totals from the rest of the box. I'm hoping the whole thing has a batch of 10% wheats mixed in.
Edit, early a.m., 20 October: Entire box sorted: Grand total $1.15, for a 4.6% of wheaties. Didn't hurt that around half of them were from before 1930. Nothing super rare, but a 1909 and a 1919 D were fun to find.