NPH Mailbox

NPH unit's mailbox  is as follows: Apt 7A, 7B, 7C all in Main Door 7B (all these three units are by using mailbox 7B, which is followed by the Main Door 7B) Apt 7D and 7E are in Main Door 7A (these two apt are by using mailbox 7A) And apt 7F and 7G are in Main Door 7C