Several of the A340-300s are the examples originally delivered to Air China. I don't know whether the F-W... registrations that they are currently wearing are the same as their pre-delivery ones.
Clearly they are never going to go back into service - you can't even give A343s away nowadays.
The A350 is probably msn 004 (F-WZNW) - the one painted in hybrid Airbus/Qatar colours. I don't know whether it's to full production standard, but in theory it's available for sale and I suspect it will end up with a corporate/VIP operator rather than an airline.