I don't think that the registration cards say PCEWorks on them. I believe that someone on eBay was asking something like $100 for one.
As I've said before, we have every reason to believe that he made large batches of unbranded Sylphia/Renny Blaster/Fausette Amour/Kaze Kiri either before, after or at the same time as the PCEWorks branded copies.
esteban's comment above shows how effective the branded copies we know about would be at passing off unbranded ones. We've also since seen 6 copies of Renny Blaster up at a time on eBay since the PCEWorks copies came to light. Before that, there was only one ir two a year. Unfortunately, a trend among mega sellers also started around the same time: only showing one or two low quality photos of games they are asking $100+ for.