code: func (c *Callbacks) OnCDOTAUserMsg_ItemFound(fn func(*dota.CDOTAUserMsg_ItemFound) error) {
  	c.onCDOTAUserMsg_ItemFound = append(c.onCDOTAUserMsg_ItemFound, fn)
  }
docs: // OnCDOTAUserMsg_ItemFound registers a callback for EDotaUserMessages_DOTA_UM_ItemFound