[hcv123]

Interestingly the 1968 Bazooka baseball boxes are most frequently found with 1 set of flaps cut off similar to the ATG box you posted. Unfortunately, there is no confirmed/confirmable reason for this. The flaps were cut off long before the grading companies existed - I know because I saw a number of them. When PSA started grading them they folded the flaps (that is what is going on with the graded box you posted) back on the larger (25 piece boxes), the 20 piece boxes were small enough to fit into their holders from the beginning).

I don't "buy" the kids gum theory. Sadly I don't really have a plausible theory though I have considered and asked the question before. All other years of boxes are usually found intact with flaps (I did own a set of 1963 boxes with just the very end of 1 side of the flap cut off).

This does of course make boxes with both sets of flaps much tougher and more desirable.