is OP still here?
can you explain your env used to create tx? win, mac, nix, python, btc core, other wallet? what a flags was used to compile openssl-1.0.1c?
If you read the OP you would see that OP was not the one who created the transactions.
BTW, the one who created the transactions explained it in another thread. He just generated a series of normal full-length private keys with good PRNG, and then manually masked (XOR-ed) them to required length one by one.