CUCM by default has default values of how many traces and how big they can be (MB).
Once you reach the last one the 1st one is going to dissapear the next time around (can't recall if they're overwritten or deleted and replaced with a new one)
How long can it take to fill all those files up? that completely depends on the amount of traffic and the trace level and options you have.
If the oldest ones you can see are past the time you're looking for then I'm afraid they're gone.
HTH
java
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HTH
java
if this helps, please rate