Best way to farm dust sprites? Without Monster Musk

[yekomp.alt]

I want the burglar ring for quests like Fragments of the Past, any tips for farming dust sprites?

[PichuYang]

Spamming elevator. Nothing on floor 45, 55, 65? Go back and change floor again.

[Nakos]

I seem to find more on bad luck days. Could just be my imagination though.

[red255]

find an infested floor and farm it?

[Snowy Sprout]

I spam floor 60, because you can see the whole thing at a glance. No sprites? Back to surface and spam again.