You're making assumptions. There are lots of reasons why they won't move, which may have nothing to do with the smell. I've never reared this species, but if it's just two workers, wait til it gets at least ten workers before you move them in. Also, did you fill the water tower to the brim and using a nestmate?
Did you order a Type 3 specifically? The Mini Hearth has different options. Just because you ordered one doesn't mean it is a Type III.
Again, this thread isn't THA tech support, so if you have any questions regarding your order how or how to properly setup the nest and have the ants move in, please contact them.
Moved small Melophorus colony into my recently purchased Mini Hearth
They stayed wandered the outworld for quite a while.
Then the queen entered, explored and left the nest area twice.
And she didn't like it... she, a nanitic and a minor worker are still in the outworld hanging out behind a small fake plant.
I have made a red film cover for the front glass panel, so it should be "dark" to them.
The nest has a very strong chemical smell, even after a rinse and airing for a few days.
Much like when I first got my Type 2 Atom C nests.
I thought this nest was a Type 3 and didn't have these smells?
So she must notice the smell... or it's maybe too big for her liking inside.