Someone can be forgiven for thinking that "unlocked" means "not locked" rather than "locked but with only one lock". I only buy used devices from online market

Someone can be forgiven for thinking that "unlocked" means "not locked" rather than "locked but with only one lock". I only buy used devices from online marketplaces/vendors with free returns, as it keeps the incentives aligned such that sellers don't want to hide defects (as it just increases their return rate).