Where is it? You cannot decide one day that GPL software is not GPL anymore because it doesn't fit you're business needs. I don't really want to antagonize the issue though I just want the source. Astaro may have done a lot to contribute back to projects but it doesn't change what the respective projects are licensed under.
I'd be curious to know how you can tell? ( Genuine curiosity, not a sarcastic smart @ss remark. )
My experience with most GPL'd software under Linux (having spent time since 2000 under the hood of various distro's) is that you can't tell just by looking at the binaries if the program has additional code that's not in the upstream sources. Gentoo for example, I can generate a binary with several different checksums just by changing compiler options. Only way to know there's different code is to interact with the program and see what works and what doesn't.