I picked up the plastic tokens as well and also only received 7 blue action tokens. Seems its a mispack, so you're not alone. I'll probably just use one of the cardboard tokens. It sucks, but in the scheme of things isn't too big of a problem.
I have 8 in mine as well. Definitely just use a cardboard one or something for now, because you'll likely be waiting for quite some time for a replacement from CMoN; it's been a few months since I've requested replacements for some Black Plague tokens that had paint issues and still haven't received them.
I haven't opened most of the other stuff outside of the core box, but my core box was missing a black counter base for the controller. I'll probably open up the other stuff I got soon just to check for other issues before submitting a CS request.
A friend got Zombicide Black Plague and was 'Oh there's so much I'm not going to open it all up until later' and I was like 'No! The first you must do is open it all up and do a parts check'. You want to deal with CMON customer support early and as little as possible.