PSA Submission Question

OK - I'm doing the 50 card $4.50 special. I've never submitted this many on my own (it will be about 70 cards). Do I fill out four different submission forms or do I fill out one and then attach something to it that shows it is all part of one submission? Thanks in advance.
Sam
Sam
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Comments
Large Submission Form
Scott
Always plenty of PSA-graded cards in my ebay store -- https://ebay.com/str/thelumbercompanysportscards