if you submit them in the holders you have (crossover) they will grade them, but if they grade them below the grade of the current holder, they will return then unchanged to you and you'll be out the grading fee, if you feel they would still grade high, although not 70, remove them and submit them raw with your expected grade, atleast this way you'll have a coin graded by a company most will accept as being accurate, or simply leave them as is and know they probably won't sell for anywhere near book value of the stated grade.