I've resisted posting for a long time but finally gonna chip in as Fresh has pretty much stated exactly what I think so want to step in to back him up.
I personally use authentic and authorised interchangeably. If they're authorised then they are authentic and therefore genuine, ie not fake. If they're not authorised then they may as well be fake.
These "just in case" pairs are never intended to be released. They're only meant to be 54 pairs and as they are not part of that authorised 54 they are unauthorised and therefore tantamount to being fake. It doesn't matter that they were made by the same people using the same materials. It doesn't matter that it took 55 or even 10000 pairs to get to 54 satisfactory pairs. Only 54 numbered pairs are allowed to exist, released to market. All excess pairs should never ever see the light of day. If somebody was to try and tell me that a pair outside of the Nike 54 was authentic then I would laugh in their face so yes I would consider them to be fake. No matter how much people spin it, if they are not part of the limited run, read authorised, they hold no value compared to the real thing. If people want to waste their money then they are welcome to it, but I would never pay above retail, I wouldn't even pay retail, for something that's not authentic.
Back in the day I used to hear "grey import" all the time, not "grey market". The definition of this, to me at least, was the selling/exporting/importing of authorised, genuine, goods in an unofficially sanctioned, ie unauthorised, market. Back in the day my experience of this was with genuine video games from Japan and USA being sold/imported into the UK. These were products that were 100% authorised in their respective countries but were never officially available over here so people had no choice but to unofficially import. To me the modern "grey market" is what "grey import" once was. Back then the market was not as global as it is today. You don't need a reseller to import something for you in an unauthorised way, an authorised retailer will do it for you - I got my Jordan XI low's sent to the UK by East Bay who are most definitely authorised. I know I'm gonna get some hate and I don't care what wiki says - I pity the people that rely on it as the de-facto authority for these things - "grey market" for me is the selling of authorised/genuine goods outside of retail environment, eg the reseller market. Everything else is just stupid.
People may hate on Nike for "operating sweat shops", but as people have already said, Nike do not own the factories that make their goods. Whilst they are no doubt not helping, I don't see them as the main culprits of the sweat shop conditions so think what happens when the Nike contract has ended. Do these places just let the employees stay after hours to do what they want? Use the factory resources for their own profit? Make these extra pairs for their own personal gain? Somehow I don't think so. They aren't co-op or fair trade factories. They might get away with a little personal gain every so often but no on the scale that things appear to be happening. The workers are still workers. Somebody is pulling the strings and issuing orders, keeping things running, and I suspect there's a criminal element to it. Personally I don't want to be part of the market that fuels this kind of thing.