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AnthonyChris, my experience was just a little different than yours. I bought my first baseball packs the first week of August, 1970. I remember because summer school ended the week before, the last week in July. The packs were definitely 4th series- I got Felipe Alou, all stars of Brooks, Carew, Powell, and Reggie, Dodgers and Phillies Team cards, Mauch, O'Donoghue, and I"m sure a few others I can't recall. I bought them until school started up, and never got 5th series cards at all.
The next year I bought thru the 3rd series until school ended and we went out of the country for the summer. My dad bought me a box while I was gone, it was 5th series. We came back right after labor day and cards were completely gone- they had already started stocking football. I did find some of the last series on an ice cream truck a year later, so they did make it out this far (Santa Monica) but not on a widespread basis.