For anyone who's interested in scale models but isn't aware of this resource, the wiki Scalemates is a good one for reference. If it has a drawback, it is that it
is a wiki, it is maintained by the members. So the info is only as up-to-date as what they post. But it's generally very good.
This thread made me curious, because I didn't know anyone ever kitted Chitty-Chitty-Bang-Bang. So I searched on Scalemates and found an entry each for the Aurora and Midori kits. According to the info people have posted, the kits are unrelated.
This is the article on the Midori kit:
https://www.scalemates.com/kits/midori-chitty-chitty-bang-bang-1910--1452482
As far as the Aurora kit goes, I suspect that the molds didn't make it through the company's "going-out-of-business" sale when it closed. Monogram never rereleased it, if they had the molds. Perhaps the molds were part of the sale, but were damaged in the train derailment in upstate New York, that damaged many of the molds. After the wreckage was cleaned up and the shipments eventually reached Illinois, Monogram triaged them. Those molds that were too badly damaged to repair, or not of sufficient quality for Monogram to re-tool them and re-release the kits, were sold for their scrap value. The ones Monogram considered up to their quality were retooled as necessary and entered Monogram's catalog-then the Revell/Monogram catalog, when Odyssey Partners merged the two companies, and eventually the successors when Hobbico's bankruptcy rang down the curtain on those classic American brands.
There are some sellers of classic kits online; Rare Plane Detective is one that comes to mind immediately. Otherwise, it's a matter of time and visiting shows and watching online auctions and sales for a reasonable sale. Not quite a fit for your immediate purpose, but that's all I can think of, off the top of my head.
I'll have to see if I can find any sales or auctions, too.
I hope that helps!
Prost!
Brad