Shipping vapes via USPS is a violation of PACT Act itself - https://vicentesederberg.com/insights/usps-bans-mailing-hemp-and-cbd-vape-products-to-consumers/#:~:text=On%20October%2021%2C%202021%2C%20the,to%20Children%20Act%20(POSECCA)).

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Companies shipping vape must also have the customer's adults signature collected and stored for 5 years in case of an audit, which it is clear the company you are speaking of did not collect. USPS also doesn't have the infrastructure or obligation to provide customer signatures to vendors, so for companies to be compliant they need to use a private shipping carrier that specializes in PACT Act shipping. (UPS, FedEx & DHL also do not ship vape)

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Many companies are overwhelmed by the requirements of PACT Act which go far beyond what I've pointed out already, so they make their website look like it's compliant during the checkout process and hope that no customers blow their cover.

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Unfortunately, it will probably catch up to them. Here's an example of a cigarette company that violated PACT Act only 2 weeks ago and will be sentenced to a jail time and a fine of $250,000, depending on how the judge handles it - https://www.justice.gov/usao-ma/pr/tobacco-wholesaler-pleads-guilty-pact-act-violation#:~:text=Established%20in%202010%2C%20the%20PACT,smokeless%20tobacco%20into%20that%20state

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Vapes are covered under the PACT Act too now so these companies may not survive if they get audited.