What do the icons on a personal traveler represent?

Attribute	Description
	The creator promises you'll find a genuine, 100% hand-carved stamp in the letterbox and not a store-bought or custom-made stamp.
	The letterbox contains a unique, custom-made stamp.
	The letterbox contains a store-bought stamp rather than a hand-carved or custom-made stamp.

Attribute	Description
	A trail-only personal traveler means you must find the owner while on the trail in order to nab the stamp.
	A limited time traveler means you better get the stamp soon, because it won't be around much longer!
	The brain icon represents a mental challenge which may require research or solving a tricky puzzle.
	The impersonal traveler is much like the personal traveler in which it travels from place to place with a letterboxer, but it's often left unattended for other letterboxers to acquire such as at a campsite or on their vehicle.