Greed
Cinder takes some stuff.
Looking carefully at the insects, you think that a 'carbuncle vibe' is just about right, really. It looks like each has a large central jewel built into the clockwork body. They are fluttering about near the top of the hole in the dome (30 feet above the floor), although definitely out of reach from the roof.
From the Performers Room, you take the wands. Given that there was 'no obvious way to open the case', I assume you smash the glass. As you do this and grab the wands, a shrill alarm whistle goes off, lasts a few seconds, then repeats a total of four times. Afterwards, though nothing seems to happen in consequence. The wands are yours.
You climb the stairs to the box seats. At the top, a velvet rope blocks your passage (but it's easy to duck under). A long thin corridor stretches down, opening into three different viewing areas. At the end of the corridor is something tall, perhaps a statue, underneath another white drop cloth. Just before the covered statue, a stand holds an empty frame, and scattered all around the floor are shards of broken glass. The glass is multicolored, but what was once depicted here is lost now.
You enter the box seat and examine the body. It's not a corpse at all, rather it seems to be a human sized and shaped mannequin. You remove the cloak, gloves, and fine clothes... the mannequin was dressed as a courtier or perhaps lesser nobility, i.e., with breeches, surcoat, and a frilly bow tie. A thin gauze mask covers where the face of the mannequin would be. Near one of the hands, under a velvet bench, is a silver chalice.