When spell components are consumed or have a cost, they need to be provided and cannot be substituted by a spellcasting focus. The find familiar spell has such components:
10 gp worth of charcoal, incense, and herbs that must be consumed by fire in a brass brazier
Now obviously, the charcoal, incense, and herbs have to be provided as they have a specified cost and are consumed. However, what about the brass brazier? Does the caster have to provide that as well, as there are components that have to be provided and they directly interact with the brazier?
It doesn't logically seem like something a component pouch could replace, mostly those things are some small items. On the other hand it seems unreasonable to carry a brass brazier around, sounds heavy.
A related question about the brass brazier: What are the details surrounding the brass brazier required for the Find Familiar spell?