Thank you everyone for the helpful feedback. The consensus is clearly: Save my back and leave the absorber and ferrite tiles in place. Compare radiated emissions measurements in the chamber to those on the OATS (several suggested a comb generator for this purpose). Assign an adjustment factor to the chamber measurements to correlate as closely as possible to the OATS measurements (6dB has been suggested as a reasonable factor, although I need to confirm this through my own measurements).
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