I get a feeling as another chap who had an issue with the glowing warning lights (faulty instrument cluster) he thought his was under warranty still but was registered to the conversion company not him so it was out of warranty before it was 2/3 yrs old,
Reckon there's a potential large grey area, as I'm pretty sure these conversion companies take the base vehicles direct from import centres, so it's up to them I guess to carry out a proper PDI etc and make sure it is done, and warranty or balance of warranty info passed on,
Your suggestion that it was a show vehicle and if he knew it was destined to be a show vehicle then quite possible he left it in showroom mode to save quite a few ££££'s
But also could be a simple error or faulty unit
Either way it may need to go back to supplier or main dealer