Extract VMWare Server serial number

Hi folks, got a bit of a fix going on here. I've got several test servers virtualised on an old server running the VMWare Server free for non-commercial use, however the hardware has finally given up the ghost and I need to install the server onto a new machine. HOWEVER, it now appears that when trying to install it needs the serial number which was given at the time (about 3 years ago). I saved the link to the VMWare site which gave my number, but that link no longer works, as VMWare seem to have EOL'd the Free version of Server.

Is there any way of extracting the serial number from the machine. I can probably run a shell script, but I cannot connect to the server software. I have tried repairing the server, but it won't connect through ports 8333 or 8222.