It seems that one other sail also fell off the wagon that day (17-18/10/07) -
a 4.2 Naish Session, in a red bag.
Mine was picked up half way between the Bundegi turnoff and the wind turbines - so keep an eye out - someone might have picked it up.
Could have ended up on the side of the road somewhere between the lighthouse and... gnaraloo

. It's a longshot, but worth putting out the word.
As for my sail - Thanks for the offers (Exmouth's a pretty big deviation from Karratha to Perth !!). No go at Austpost (no comment - but I think the guy who works there tried his best). I've spoken to Steve at TollWest and it sounds like that's the go - my local hero said he'll take it there at lunch - so should be on track soon.
(insert joke here about tying your gear on properly)