It should be noted that the shares cannot be written off unless the shares are disposed or a loss declaration is issued. The SMSF is unable to wind up until the share value becomes nil and there is no expectation that any dividends would be paid.
Accordingly you should contact the administrator or the company holding your shares to ascertain the current value of your shares.
Alternatively, you may contact the associated share registry to transfer the shares to your personal account at market value and deposit the proceeds into your SMSF bank account.