PCGS BU designation - ATB sets

So I ordered a set of ATBs from AMPEX--says they are PCGS slabbed as BU. Correct me if you know different, but my understanding is that these were graded in a bulk submission without regard to actual grade. Therefore, they theoretically could be anywhere from MS 60-70?
Once I receive the coins, what if I wanted to send them in for an actual grade? Would I submit just under regular service or something else since they have already been graded BU?
Once I receive the coins, what if I wanted to send them in for an actual grade? Would I submit just under regular service or something else since they have already been graded BU?
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I knew it would happen.
bob