I've purchased multiple cman ball bearing griplatch boxes in the last few months and there was no notation of COO anywhere. The only possible hint, which means nothing, was all the "inspected by" names listed were english sounding.
I like the griplatch boxes and think they're great for the $. The only problem is getting one that isn't damaged in shipping- open the box and inspect it in the parking lot when you load it.
I would not buy a box w/o ball bearing drawer slides- I have an older waterloo w/o bearings and when heavily loaded the drawers are very hard to open. The cman bearing boxes are not expensive and you can probably get a nice one on CL for maybe half of new.
As far as Mac, in the 80s at least some of their boxes were made by Waterloo and were identical to the waterloo sold from places like Grainger, less the nameplates, which directly interchanged. I worked with a guy with a Mac, and I had the Waterloo, right next to each other, and they were the same less the nameplates. The new griplatch BB boxes are much nicer than my 80s vintage Waterloo- which was the same as a Mac.
from the old lady, decent 300 piece craftsman set. I figured it was a good place to start as it has most of the major stuff covered. We have an offer in on a house now with a decent sized 2 car garage, so space is not really a limiting factor. I have looked into the 5 drawer HF tool cart and it does look promising. As of right now 200 is more or less my limit as this will probably be a 
. They're stamped, formed, painted, and packaged in china.