No ideas, such pieces can be a real pain and you need a photograph to reassemble them.
We have a multi-piece sculpture that has to be taken apart whenever we move and nine times out of ten, in the chaos of moving, you can never find that photo. But as the artist said when I asked for a copy of a photo - it does not matter, if it will go together in a different order that is fine, just put it together with your heart and it will be correct - whatever order.
Hopefully, someone will recognise it for you, but you could also email the picture of it dissembled to Pilchuck for their opinion.