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First off, put the two applications in two separate envelopes. Mark the envelopes as to what they are ...
I have done both the following in the past
1. Send both apps to EAD PO Box (after ensuring that the sub envelopes are marked clearly). AP 's receipt date was late by a week.
2. Send EAD and AP in separate packages to their respective PO boxes. This time EAD's Receipt date was late by a day!!
What goodsaint is saying is that , the PO box numbers are different for EAD and AP , so why do you want to send it in one package??