Old (ancient) Mac - MLB/ROM extraction

Hi guys

Finally the only way I have had success to get iMessage working on my hack is by using my MacBook's real MLB and ROM with fake serial.

But since it's my MacBook that I use daily, I am afraid if I use both devices by any chance, I'll get myself banned. I've found an old Mac in my possession that I can finally boot. It's running 10.5 (OSX Leopard).

Is there anyway I can get MLB/ROM off it? I've tried Darwin Dumper and iMessage debug - both won't work on that old OSX.