Letter Boxing Advanced

Complete the Letterboxing honour.
Create a letterbox stamp, post clues on a website, establish and maintain a letterbox for six months.
As a unit, club, or family, find the clues and then locate an additional 20 letterboxes not found for the basic honour, eight which can be part of two or more series. Individually "stamp in," imprint the letterbox stamp in your log book ,and record your find on the website.
Design, create, and carve your own hitchhiker stamp. Hide in a letterbox, post on a website, and track its travels for six months.
Participate in an exchange with letterboxers other than your local club members and obtain a minimum of 20 stamp images.