I think the capital loss can be carried in perpetuity until a capital gain is made in the future and then it can be offset against those gains.
Also, I think the 3 & 5 year record retention rule does not apply to CGT, ie, I think that you have to keep records of capital gains / losses forever or until the ATO informs you that they are no longer required.
It may be a moot point as the options may do a ' Lazarus ' in the coming months - ya never know in this big city what can happen.
