UPS and FedEx characterize shipping addresses as either residential or commercial. They apply different shipping rates, and sometimes offer different services, depending on what type of shipping address is involved.
When Boxify queries these carriers for rates, they provides commercial rates if the customer indicates a company name at checkout. If not, they provide residential rates. So there’s no real address validation. If you are predominantly shipping to residences and are worried that unscrupulous residential customers will enter a fake company name to try to game the system, you can either not provide a field for company name at checkout, or you can adjust your Boxify preference settings (by clicking on the "Adjust preferences" button on the Boxify dashboard) to prevent that by treating all addresses as residential.
Note that FedEx uses “FedEx Ground” for commercial addresses and “FedEx Ground Home Delivery” for residential addresses. That’s not true, though, if the package weighs more than 70 lbs, in which case FedEx will quote a FedEx Ground for it (and possibly FedEx Ground Home Delivery as well), even to a residence.