If there are boxes that you would like to adopt then first try
contacting the owner. If after a few attempts you have no luck then
contact the webmasters - you can either use the contact function on the
site (bottom of main page) or send an email to
webmasters_at_letterboxing_dot_org.

When you do adopt a box make sure that you credit the original placer
with the clues, stamp, etc. as applicable.

Trish
One of the LbNA webmasters