Google China hackers stole source code
uk.news.yahoo.com
uk.news.yahoo.com
It seems to only claim that source control services are a good target and are frequently configured with no security (which is A Bad Thing), but does not blame Perforce as an attack vector. The article implies, however, that Perforce was used as an attack vector which does not appear to be the case. Of course, it is very hard to discern what the article actually says when they spend one sentence per idea, with no further explanation or investigation.
[1]: http://siblog.mcafee.com/cto/source-code-repositories-target...
It seems like a lot of developers write closed source, commercial systems with the assumption that malicious users will never see it.
But anyway, feel free to go ahead with your plan. But it might be a waste of your time; the bits on my hard drive are already public: http://github.com/jrockway/.