What shipping service for parcels has no guarantee and is not sealed against inspection?

The correct answer, USPS Retail Ground, is a shipping service that provides an economical way to send packages, particularly for those that are not time-sensitive. Unlike other services such as Priority Mail, USPS Retail Ground does not come with a delivery guarantee, meaning that while packages sent through this service will be delivered as quickly as possible, there is no assurance of a specific delivery timeframe. Additionally, packages sent via USPS Retail Ground are not sealed against inspection, allowing postal employees to open and inspect the contents if necessary.

Understanding this distinguishes USPS Retail Ground from services like Priority Mail, which typically offers guaranteed delivery times and additional security features. Similarly, First Class Package Service includes a form of tracking, and Media Mail has specific restrictions on contents but, like Retail Ground, it does not include delivery guarantees. The absence of both a guarantee and sealing against inspection makes USPS Retail Ground a unique option for those who prioritize cost over speed and security.