I am convinced, and this is only based on what I personally saw, that these blue checklists were issued only in the five series packs which included all 660cards. Nearly 20 years ago, I found a nice bunch at Orlando Sports Cards for $1 each and the owner told me he got them all the time from locals. Since those Florida packs were all inclusive. I always believed that with the cards I saw there and in Ohio (another place where all the series were distributed at the same time) they were included in the five series packs.
The other reason I believe that is they were almost impossible in the New York Metropolitan area and we almost never saw those cards in any of the 1973 collections we bought and I bought tons of 1973's over the years.
Just my opinion
Rich
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