@ Bilalab OS has two mailboxes in glory square. It also has a lot of other functionality such as an auction house, pet hunter, crafting, guild access, snoop with many locations, two house accesses. I do agree with anyone that brings up that OS does have some drawbacks too.
not sure what ur point is... glory square only has 2 mail box, AH, bank and potion merchant only. everything else is at different locations (or squares). even than AH and bank are kind of out of the way and therefore has a lot of places where random merchants can be thrown in... I only suggestion was that pcoins merchants have mailbox near them, whether they are put near the mailbox or the a mailbox is added with them near them...