I don't have any inside info on the current sale progress, but do know a few things:
$10M for a fully serviceable B744 is rubbish. The 747-300s topped that when traded for coke cans without instruments/engines/interiors etc. Check out the websites for grounded/damaged/no-engined B747s and you'll work it out...
The B743s have all been sold, delivered and (I hope for QFs sake), paid for. That post is a furphy, A320.
Boeing will now provide an STC for B744 pax to freighter config; given the number of classic freighters still flying and the status of the 748 program, I'd say these aircraft are still very much potentially saleable.
Surely on the books these A/C must of been written many years ago
One of the main problems with Qantas accounting is their depreciation procedures. There is a lot of plant more than 20 years old still excessively valued. Eg. OJH insured at $100M when it pranged and repaired at a cost of ~$150M - a result of dodgy finanicial control (notwithstanding hull-loss implications).