You've confirmed something my very wise wife suggested might be true . . . all particle board might not be created equal. As I mentioned in another post the particle board I have shows some evidence of water with watermarks (most likely from carpet shampooing over the years and one spot where a design flaw with a bad foyer allowed water to leak into the house for years) and yet the wood shows absolutely zero signs of swelling or deterioration (i.e. delaminating into a crumbly pile of sawdust). What you've said leads me to think that I might have got a bit of luck and the former homeowners might have not bought the cheaper stuff which I have personally seen swell up with the slightest amount of water, disintegrate into a pile of sawdust, etc.
Since this area will not be shampooed, we don't track in stuff (shoes go off in the mudroom . . . I even make Hiram and Medawisla do so when they visit since they've now been to our house several times and are no longer considered guests, but part of the family ) and the faulty foyer has been fixed I'm thinking that short of a flood moisture issues may not be a problem with this subfloor. In addition, I'm thinking putting a sealant down might also be a good idea as some added insurance.
You convinced me on the glue deal . . . I think I might try Vic and your suggestion to try stapling the floor down and see how it holds. Based on the fact that it took Hiram and I some work to remove the carpet tacks and my wife is still working hard at digging out regular ol' staples from where the former owners stapled down the carpet pad I'm thinking the holding power might be OK as well . . . providing I don't have to rip up the flooring at a later date since I suspect that would cause the particle board to no longer be any good.
Acclimation . . . check. I've been letting the wood acclimate in the house for over a week now . . . I talk to it occasionally, pat it's glossy finish . . . you know just to make it feel at home.
Manufacturer warranty . . . as you might have surmised buying this stuff at "Mah-dens" basically means there is no manufacturer warranty which I realized from the get-go. Couldn't pass up the wicked good price though . . . for the price I couldn't have even bought mid-priced laminate, much less paid for pricier wood flooring.
Subfloor . . . if this was me and I was building a home today there is no way I would ever go with particle board in a home . . . I detest the stuff for many, many reasons . . . definitely plywood or possibly Advantek OSB (which is what a contractor used when we fixed the leaky foyer.)