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If it was pro install there may be wires to other potential spots in the house. Do you have phone jacks? Often put in the box with them.
Do some of the cables go up and others down? Can you find any in the basement? If everything is hidden then was probably put in during construction, if bundles go up and or down probably done later.
A telephone wire tracer is a good tool, attach to one wire and use a receiver to follow the wire.
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