A "depository drop safe," or "loading depository safe, safe depositories, or drop box" as they are sometimes called, is a particular form of safe that is most often used in commercial enterprises and applications. Usually, these are rented at a postal store or at a bank. A quick answer to why one would actually purchase a depository drop safe is A) to keep personal effects in a safe place, or B) to save some money over the long term versus renting in perpetuity. Many small or home-business owners use these safes to keep their cash safe and out of sight, though by no means are they the exclusive market for safe depositories.
These safe depositories allow anyone to make deposits or "drops," but these deposits can only be taken out by those with access. The most common example, in the U.S.A. anyhow, is the blue United States Postal Service out-bound mail boxes on many main streets across the country. Another example would be your financial institution's deposit box, though many have moved to an electronic ATM that receives deposits now. They are popularly used by businesses receiving large deposits of money or other valuables.

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