Attached below is the wavemaker position time series, if you are trying to include the actual wavemaker motion, rather than an idealized analytical solution.
This wavemaker position will be identical for both benchmarks.
First column is time (in seconds, with the same time datum as the provided free surface and velocity time series).
Second column is position (in cm, where the location is relative to the coordinate system of the provided tank bathymetry, i.e. position=0 in this file corresponds to x=0 in the basin bathymetry data).
-Pat