When the surveillance tapes from Louis’ place hadn't been recovered, a part of it could be viewed, and Oliver appeared in the tapes. However, Courtney had just brought him home at that time and his identity was unknown, so they couldn’t find any problem with him.
In addition, almost every house in Oreus was a hostel, so it wouldn’t be odd if Oliver was a university student spending his time in Oreus at that time. Therefore, Alexander wasn’t suspicious of him at the beginning.
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