But when you're buying an item it always shows who the seller is, just don't purchase the item if it doesn't show the actual brand of company vs. some random seller name. I've never purchased a scam item from Amazon and I've had an account since 1999.

I'm not sure if you understand what commingled inventory means.

When inventory is commingled, Amazon puts all of the sellers' products (for a given product ID aka ASIN) into one urn. When a user makes a purchase of that item from any of those sellers, Amazon retrieves an item from the urn and ships it to the purchaser.

As a purchaser of items sold by multiple sellers with fulfillment by Amazon, it's not possible to know if each seller has their own urn, or if it's a single urn for multiple sellers. The distribution of the urn by source is also unknown.

I won't purchase easily counterfeited objects from Amazon, unless there is only one seller listed, and if that seller is either Amazon or an account that seems like the manufacturer. A random Samsung sd card[1], though; who knows . Something like this Anker usb car charger [2] looks reasonable (I'm not specifically endorsing Anker, usb chargers are just a product in a crowded, junky space, and Anker is a brand that's trying to present itself as selling good products.

[1] https://www.amazon.com/gp/offer-listing/B06XX29S9Q/

[2] https://www.amazon.com/gp/offer-listing/B00VH84L5E/

The problem is that Fulfilled by Amazon items have co-mingled inventory, so items bought from amzn_bob_1985 may actually be coming from stickers_on_alibaba_crap99's comingled inventory. If you do receive fake goods, there's no guarantee that it's actually the fault of the specific seller you purchased from.

Amazon mixes their own inventory with the third-party sellers. Even if says "Sold and shipped by Amazon" on the checkout page they will ship whatever item they find most convenient. It could be sourced by them or added to their warehouse without any verification by a random seller. There is no indication during the checkout whose item you get (likely they don't even know it themselves at that stage).