Coffin Lid and wind up Echidna too rare?

[zosia]

I have ran void ark about 20 ish times since release and I have not seen either of these drop at all.

Also, I have not seen a single coffin lid or the furniture it makes on the MB over the past two weeks. There is also no sales history for either item, so neither item has been sold at all.

Where are these items? They seem too rare to have to roll against 24 other people for them.