Are the color schem and specifications identical to the original Kyosho? If so, they are from China. I found the original manufacturer of Kyosho kit in China. The company build what appears to be Hangar 9 Mustang (60 size), several Kyosho warbirds, and others.

Some Chinese guys get them directly from manufacturer with a little different or plain box with out stickers or company names removed. Most of time, the manuals are identical.
So far thats what I know of some ARFs of well known companies.
I don't remember where I put the link to the company. If I find it, I will post it here.