Thanks for the additional information but sorry for any confusion with the site.
The biggest problem in terms of toxicity would be the cocoa. Dark and milk chocolate can also cause issues but cocoa is much more concentrated and would be expected to cause the most symptoms. If one dog ingested only 5 ounces of cocoa, I'd expect that you'd be seeing significant signs by now such as vomiting, trembling, elevated heart rate, and even possibly seizure activity. Even ingestion of 1/2 that amount could cause these signs.
The fact that you haven't seen any symptoms whatsoever and it's been 4-5 hours since they possibly ate multiple kinds of chocolate (n addition to cocoa) makes me wonder if they did indeed eat this much of it.
At this point, trying to make them vomit will be unproductive since the chocolate has already been absorbed into their blood streams.
Since they're asymptomatic at this point, I'd feed them dinner as they are requesting. I don't see the value of having them seen at an ER hospital since more then likely, the advice would be to monitor them for symptoms....which is what I'd suggest that you do. Should any of the aforementioned symptoms develop, then I'd take them in.
But, to be honest, I wouldn't be surprised if they're going to be just fine. And, I say this because they're acting totally normally.
I'd love to be able to reassure 100% that they'll be ok but, unfortunately, this is a lot of chocolate for them to have eaten if
1. Indeed they did eat it all
2. Even if split 50/50 between them.