This storage fee structure for my new Gold IRA has me scratching my head

• •Alright, so I finally pulled the trigger on rolling over a portion of my old 401k into a Gold IRA.
• •My question is about these storage fees.
• •The company I went with seems reputable, good word-of-mouth, and they're using Brinks for storage, which I appreciate for the security.

Alright, so I finally pulled the trigger on rolling over a portion of my old 401k into a Gold IRA. Been sitting on the sidelines for a while, but with all the printing going on, felt like it was time to move some serious capital into something real. Ended up putting about $300k into it – diversified with some gold, silver, and a bit of platinum, felt good about that mix given my background in commodities, spent enough years staring at steel price charts to know a thing or two about raw materials.

My question is about these storage fees. The company I went with seems reputable, good word-of-mouth, and they're using Brinks for storage, which I appreciate for the security. But the fee structure they laid out is confusing me a bit. They're charging an annual flat fee for storage, which starts at X amount for up to $100k, then Y amount for up to $250k, and Z amount for over $250k. My $300k account falls into that "over $250k" tier, obviously. What I'm not understanding is if this flat fee covers all of the metal, or if there are additional fees snuck in there for insurance or something else I'm missing?

Back in my steel days, every invoice was itemized down to the last bolt, so this blanket flat fee has me a little uneasy. Are there typically hidden costs associated with storing precious metals in an IRA that they might not be explicitly calling out? Or is this flat fee usually all-inclusive of insurance, auditing, and whatever else goes into keeping physical metal safe? For folks in Birmingham, Alabama especially, what kind of storage fees are you seeing with your Gold IRAs?

It's not a huge amount of money in the grand scheme of things, but I want to make sure I'm not getting unknowingly nickel-and-dimed. Any insights from those who've been doing this longer than I have would be greatly appreciated. Just trying to ensure I'm making the most informed decisions here.