Wheat back pennies

I bought four of each open 7 of them they all had teens 20s and 30s only in them and that is what I was told would be in them. it was pretty close to equal amount of each decade. did not find any key dates maybe in these last five but I doubt it thats why Im not opening them

I do see that eBay sell them for $40-$60 per roll. Im just hoping to break even on the per roll price I had to pay 35