It's evident.
With a slight nod, as a professional, Fu Qian undoubtedly had an authoritative say regarding the door lock.
With just a glance, he confirmed that Eva was telling the truth.
As previously commented, this building had seen some years, and this door served as an excellent piece of evidence.
A quite old-fashioned metal partition door, though not overly corroded, the entire piece had turned iron black with the passage of time.
The marks on the ground also indicated that it hadn't been moved for a very long time.
Including the lock on the door, a more vivid description would be that the first reaction upon seeing it would be wondering if the key could still be found.
Of course, this didn't affect the current momentum; this dilapidated lock firmly barricaded the way ahead.
[Is there another way out?]
Admittedly, such a lock structure might be somewhat rare, but for Fu Qian, it was merely a matter of spending a few extra seconds recalling.
