What happened the first day when the twins' group entered the city? The Celestial Soul System mistook the SANS City's security system for the Werdlem Empire System. Thus, it gave those messages that couldn't be understood. It was pretty obvious that the SANS City used something similar, but not the same.
That box took it into consideration, and through Rean and Zangeshu's analysis of the CAU Units and their own technological system, the box could now hack into it with the help of the Celestial Soul System itself. It was pretty similar to what Rean did to create fake identities inside the Werdlem Empire System. It wasn't as effective as Sister Orb's hacking abilities. If they tried to hack directly into the servers of the Zoshia Enterprise System themselves, they would definitely be exposed. However, simple things, like preventing Rean and Qwerty from being seen through or opening locks, weren't anything that complicated.
