Episode #1.4 - S1-E4
Stupidity: Richard is hellbent on proving what really happened, but he sits for more than a whole day on a vital piece of evidence (the phone), does not check it, and despite the fact that the victim was reported being in heated arguments with someone on the phone, he asked for no record of the calls (nor checked whose phone was it, which would have required simply inspecting the SIM card), which would have cracked the case instantly.
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
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