If he wanted a regular guitar, he would've ordered and waited for a regular guitar.
The man paid for a 10 top and waited for a 10 top.
The only correct course of action is to give him a 10 top and a discount for the aggravation or else a complete refund.
What we have right now is one person's view and they have not provided us with ALL the information YET as to who may be to blame or at least culpable. A photograph of the back of the headstock showing us all the writing on the back may well give us some of the information. For all we know, the retailer could be lying and the person is laying blame at PRS. We don't know if the retailer is to blame by sending out this guitar and claiming its a downgraded Artist Pack when its not even a 10-top. The OP may be expecting and paid for a 10-top but the retailer sent out a non-10top, a guitar they have struggled to sell, a year or older, just to get rid of it and lied to the OP about it - a lot of that can be easily worked out with more evidence!!
By regular, I was referring to the 'standard' core series with and without 10-tops - not a wood library or Private Stock - not something that people would 'normally' have to wait for these to be built for a specific run or custom order. It shouldn't be too difficult for the retailer to get in touch with their PRS rep and for the Rep to source a suitable replacement - 10-top may be a bit more tricky if the OP also is adamant on the colour but, if the OP is willing, the Rep may be able to source a PRS DC 594 in either the perfect colour or maybe within the colour spectrum (like Blue for example) 10-top. Either way, its not as if they would need to wait a 'year' for PRS to make regular core line guitars - especially one of their most popular guitars in recent years. Its not like the 'Private Stock' PRS team will be making it and have to 'slot' the build in which, at current waiting times could be a year. This is a 'regular' core line guitar!
Point is, I am jumping to conclusions at all here - unlike yourself and others. I am trying to get further information, further evidence as to what could be the cause of this situation, who may be to blame, who could be lying. A simple photograph of the back of the headstock may help, provide us with some more information so that we can ascertain if the OP is lying, if the store has lied or PRS - that information is also useful for PRS Staff that frequent this forum. I really cannot imagine that PRS have been contacted and responded in the way as claimed - stating that the guitar was destined as a Artist Pack and then down-graded to a 10-top because of that area.
Somewhere in all of this, something isn't right but I am not accusing the OP of lying, of being a troll, not having a go at PRS for letting this go out as a 10top, not accusing the retailer of bullshitting to a customer just for the money/sale, not blaming the Rep who may distribute guitars to these retailers, the person the Store is most likely to contact in this situation of lying either - at least not with the very limited information and one sided (as the Retailer, Rep or PRS themselves have NOT had a say). Its a totally bias situation and we haven't had all the information yet to be able to jump to conclusions.
To use the 'Sports Car' analogy, Its like someone jumping in and saying their 'new' car has a slightly different colour panel on one of the doors. The only evidence they provide is photos of the door. They 'claim' the car is new, bought from a retailer who they say claims it was the top line version but dropped down a 'tier' because the door panel doesn't match. They provide NO other information that may help explain who is to blame, who could be at fault here. You don't jump to the conclusion that the car manufacturer is at fault straight away and you can't just back the OP blindly either. For all you know, the car may have been at the dealers a while, been 'damaged' and repaired by the dealer who couldn't match the paint accurately and are lying - claiming it was like that from factory and to get another one in that colour at the spec ordered would take a year - despite the factory churning out several thousand cars a month. For all we know, that 'car' was made 18months ago, done 20,000 miles on the clock and is the 'entry' model - the one without the 'extra' bling and the retailer is just Bullshitting to clear that car out of stock...
Point is, we do not know enough, have not got all the information and/or evidence yet to jump to any conclusion - whether the OP is lying or being misled, whether this did leave PRS as a 10top or not - certainly if more information was provided, the PRS records would be able to tell if this was a downgraded Artist pack guitar, was a 10top or just a core 594. We don't know when it left PRS, no evidence of the year of manufacture either. Maybe something went wrong after it left the factory, that the 'stain' it that area spread under the coating. Seeped up to the surface. We don't know if the retailer is at fault or the distributing rep for that area, lying to the store. There are numerous unanswered questions here and little evidence for any of us to jump to any conclusion - all I asked for was more evidence. It seems ridiculous that a core line model like the 594, not a Private Stock or Wood Library, would be a 'year' wait - either to get stock or to replace this.
I live in the UK - a place that's much more difficult to source stock. Its not like they can just stick the guitars in the back of the truck and drive them here.I can speak to my retailer and ask about any PRS and any colour who will then speak to their PRS rep who, within a day or two can provide information, even photos of the range of guitars that fit my request - It might take a few days to a week to arrive at the retailer who will then check it over, set it up and ship it out - usually arriving a day or 2 after shipping.