Help with old pictures
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Personally to be on the safe side I would air all the contents and dry out fully. If any paper has been exposed to humid air it will have absorbed moisture like blotting paper to a greater or lesser extent. If it hasn't due to a good seal on the tin, you would have nothing to worry about but no harm will be done by drying out for a couple of days.
Once dry, I don't think it matters too much in what material you store as long as photos are not allowed to come in contact with one another. Protection against fire or flood might be a consideration depending on your assessment of value and risk.