Mercurius statue by Markus Lüpertz at Post Tower

Mercury (equivalent to the Greek Hermes) was considered "the messenger of the gods" and is the god of merchants... and thieves.

Mercurius (German Merkur) is a god in the Roman religion. Its name derives from the Latin word merx, "goods". He was equated with the Greek Hermes. His origin and other characteristics were transferred to him. He was considered a "messenger of the gods" and is the god of traders and thieves.
de.wikipedia.org/wiki/Mercurius

The former German Federal Post Office has evolved into several listed companies; the traditional postal service is now called DHL and is still headquartered in the former federal capital of Bonn. In front of the striking headquarters building—which was by no means uncontroversial when the construction plans were announced—called the Post Tower, stands a large statue of Mercury. In ancient mythology, he was, among other things, the god of trade—but also of thieves.