just a point but if you mentioned in your advert the keywords 'PLEASE' and 'THANK YOU' and also a possible REWARD of a carton of choice it might assist you in tempting the person to give back your board.
Sorry about the no THANKyou etc .Its my first time on the site and the info it asked me for became the actual posting,
Naturally 2 cartons of your prefered will be forthcoming
Regards
Pete
