This rare medium yellow-orange color is made from 44 2x3x2 Container Cupboards (4532.dat). These are
available in the Harry Potter Sets #4732
Warthog's Classrooms or #4723 Diagon Alley™ Shops. I happen to pick them up from
Amazing Bricks on
Here is a sample of the difference between med yellow-orange and orange (your
visual results may vary)...
This is medium
This is orange...