I'm thinking it was a Sunday, because the picture I posted is of a Sunday, according to the site I got it from. The bird at Petco looked almost exactly like this one. It was the almost completely orange front that was striking. I've never seen that on any of the baby Suns or Jendays.
Here's another one the owner says is a Sunday... 
Now here's something interesting, which may prove your point...
The problem is the sunday conure (jenday x sun) hybrid. Although, personally, there are some hybrids that I approve of, I think the sunday is one that should be discontinued. Whenever a hybrid looks similar enough to either of the original parent species as to cause possible confusion between it and a purebred specimen, it should be placed in a situation where it can never be bred. The sunday looks almost identical to the black-eyed jenday in body coloration. Even though most of the aviculturists that produce this hybrid sell them to be used as pet stock only, many of these birds recirculate into breeding collections. The pet owner may get tired of his bird and sell it to a pet shop that does not know the history of the bird. They in turn may sell or trade the bird to a breeder as a mature jenday. The unknowing aviculturist pairs it with one of his jendays to produce offspring that can be used to introduce new blood into his flock. Unfortunately, the offspring will be 25-percent sun conure. This is no way to increase your gene pool.
http://www.voren.com/articles/the-gold-c...n-conures/