>That's a conversation with investors about business costs.
Paid prices are revenue to the business, not cost.
>Costco was telling it's investors why they had to raise prices
It told everyone. They were public. There was zero limitation at all that it go to investors, nor a ban from investors being a customer. It might have been targeted to investors but it was an earnings call broadcast to customers, indeed publicly made available to ~all their customers.
>Customers purchasing from them are on the revenue side and there was no line item on receipts listing tariffs, just increased prices.
They line itemed in their earnings call that part of it was to pay for tariffs. Not saying an exact amount doesn't unbind you from this and if no tariffs are paid it is a false representation (though in this case, not wittingly so, though they should still pay to rectify this false covenant).
I think this is even more obvious if you remove the political bias here by just saying something like "part of our prices are increased to donate to charity." If it turns out the charity was paid but for whatever reason had to return the money and no charity was actually paid, it would be obvious the business must repay the customers for this breach of agreement the portion of price raised to pay the charity even though there was no fraud or intentional deceit and even if they never told the customers the exact amount of the increase actually initially paid to charity.
> Even if the price increase was 100% because of the tariff, the business made the decision to internally absorb the fees and not directly involve the customer. They absorbed that extra cost of business by increasing prices as needed to maintain business margins within acceptable ranges.
Costco did absorb part of the cost, which turned out to be no tariff owed. They are in a position now though where the customers are simply asking the company to do what they promised the public in their earnings call which was for the tariff increases to be zeroed since the company promised and itemized out they would be used to pay for tariffs which are zero. A non-zero increase based on a promise to pay a tariff but with a tariff of zero obviously breaches this covenant made in the earnings call, as it can't be simultaneously true that a non-zero amount was actually collected in payment of a tariff while zero being owed in tariff.
This isn't a moral failure or even a case of fraud, just customers asking the company to fulfill the promise they made to the public.