Buyer of the plant was informed that it was an indoor plant, but all that I read tells me that it is an outdoor plant.
Here are its growing tips. This Australian native is grown outside year-round in warm zones, but in colder areas, it can be overwintered indoors.
https://www.gardeningknowhow.com/ornamental/shrubs/boronia/boronia-information-and-care.htm
Hi Sue .I love listening to you. I brought a brown bronia in a 30 cm pot .Im to scared to put it in the ground. Shall i just put it in a huge pot and put slow release fertilizer on it . warm regards Deanne Ricci.
You can grow them in container! Just be sure to allow the roots to dry out down to about 5-8 cm between waterings. I would fertilize with a slow release designed for citrus. This will provide the exact requirements that the tree will need, as a general purpose may have too much nitrogen.
Here is an article that will help you to know what care that these trees require:
https://www.gardeningknowhow.com/ornamental/shrubs/boronia/boronia-information-and-care.htm