On the odd occasion where you find your arrow isn't in the Gold it may have accidently found it's way into the Green. Every effort is taken to find the naughty arrows but sometimes they hide just too well.
btw… here is an extract from the ArcheryGB Rules of Shooting, part 2, section 202, subsection g(iii) - " All arrows of every archer shall be marked with the archers name or initials on the shaft" …. just saying
Here are some of those arrows that have been uncovered by meticulous and professional arrow finders (and sometimes just by luck).
ACC arrow - Orange & White fletchings
Jazz Arrow - Red and White fletchings