You don't have to open every roll. If no mintmark is present then it is P. All rolls will be if they were in the closed box. They may be worth saving but that is up to you.
Sit on them for 3 or 4 years and see what developes with them.....then make the decision. There's no hurry. Just watch ebay and other markets.....time will tell if it'll be worth your while or not......
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