I am pretty sure someone mentioned finding stuff at Logan Hyperdome up thread. The Mr Toys site seems to show everything in every store. I suspect that Logan Mr Toys is somehow different to the rest of the stores and sourced a partial Wave 1. I think it was Griffin who said the southern stores have a different supply chain to the QLD stores.

Searching "Seige" misses a few things. Try searching "Transformers" "Cyberton" and expanding out to 24 items per page.