Again, was this signed as such? If the answer is yes or no, they're more than likely to be the usual chelodina rugosa if they had came from private supplier (The picture aren't clear enough for proper identification). Most snake-necked turtles in Indonesian facilities for a long time has been labelled chelodina mccordi because of them being generally known well in the news and outside of the reptile keeping enthusiasts, despite not being the actual species.
Currently, Ragunan Zoo is the only confirmed holder of the actual chelodina mccordi, specifically the subspecies from Timor.
@Caribbean Flamingo Like I said, most likely not the actual species (If these are confiscation from BKSDA, they're might still either be c. rugosa and c. novaeguinae, the actual c. mccordi are very rarely ever enter the local trade).