The Collector's showcases were always intended for exhibition, not concealment. However, when true concealment was required, an ordinary safe might not suffice. To safeguard the soul contract he had traded from Mephisto, the Collector crafted a cabinet from Chronovium—outwardly identical to any ordinary display case—and placed the genuine contract within.
This unique cabinet could isolate anything inside from the Timestream shenanigans. To an average observer, it appears as nothing more than an empty case. Maybe the best concealment is to pretend an object never existed at all.
