How does PSA determine whether they will grade a card or not?

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I submitted a full set of 1954 Spic and Span cards for grading. I provided them with the checklist straight from the SCD and I found out today they are being returned "NO SPEC INFO, NO GRADE, NO CHARGE". Was there something else I could have provided to them? I submitted them at an in person event and the PSA staff I spoke to said they should grade them with this support. I was under the impression that the big SCDS was the bible, but obviously it was not in my case. For those unfamiliar with the set, here is an example.

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