You never know. I visited an old friends office a few towns away last week. He collects coins, but doesn't CRH. He knows I do, so I stop by every few weeks to show off my finds. Last week I stop by, and as we're discussing them his coworker pokes his head in the door saying he CRH's too, so he joins in the discussion.
Turns out he goes through a box or two a week, rerolling the halves and turning them in to a different bank in the original box. Had a searched box in his car, ready to drop off on his lunch break. When he saw all the 40%'ers I had from last week, he said "what are those?"
He had been searching only for 64 and earlier! He went out to his car and brought back his searched box, and we opened about 8 rolls before finding a 1967 half.
You just never know...