The series makes more sense in order, so here is the correct time-line. Only one short actually fits in, the others just go wherever.
1 - 'RnC Story', proper title; 'The Diamond Of Invisibility'
2 - 'Missing'
3 - 'The Lightning Quartz'
4 - (Short) titled as RnC Shorts, properly called 'The Fire Within'
5 - 'Mystic Powers'
6 - 'The Collector'
7 - 'The Fountain Of Fortune'
Keep your eyes out for story 8, 'The Silver Mare', coming soon!