Well, the reason it would smell is because it's put in a small box with no ventilation. So it builds up. A few hours sitting out, you wouldn't be able to pick up any noticeable scents just walking around in your room.
Wish it was that simple. I have three Atoms with the built-in mini outworld that still has the scent. Been airing them out for nearly a year. Every time I put a colony in there, it kills them.
M. navajo, P. rugosus, Forelius sp., and V. pergandei were the casualties.
I ordered a THA fortress and I moved my Formica Pacifica colony into it right away with no deaths. Even though it had a strong odor to it fresh out of the box. A few weeks later, and the odor is gone and the colony went from 20 to 155 workers in 3 months!
Right, it is a hit or miss, you got lucky. Just because you didn't have any issues doesn't mean it won't happen to others. Had three buyers who killed off their entire colony (All of them were N. cockerelli) within 15 min of putting them into a Fortress - which incidentally also took over a month to receive. You can tell by the workers behavior that they won't make it. They drag their antennae on the ground, twitch, walk around in circles, and move very strange.
Needless to say, I was on the "tech support" end and trying to help them recover whatever they could. Wasn't fun.
I would caution all buyers about this, especially if they spent the time or money to raise a colony.
At the same time, had buyers with C. modoc that moved into a brand new Fortress with minor issues (a number of dead workers). Some species are also much more sensitive to chemical smells (like Acromyrmex in plastics) than others.
I submerge everything in water and let air it out now. Did this to the last three Fortress that was ordered, and had zero deaths in transferring the colony (C. sansabeanus, Polygnyous C. vicinus, and M. mexicanus).
Just to be patient. Don't just dump the entire colony into the formicarium once you receive it (it's understandably hard to do because it takes him so long to get them delivered in the first place)