Fills the tooltip with information about an item attached to a message in the player's inbox
Signature:
GameTooltip:SetInboxItem(mailID, attachmentIndex)
Arguments:
mailID- Index of a message in the player's inbox (between 1 andGetInboxNumItems()) (number)attachmentIndex- Index of an attachment to the message (between 1 andselect(8,GetInboxHeaderInfo(mailID))) (number)