/usr/bin/iceboxnet-3.5 is in libzeroc-ice3.5-cil 3.5.1-6.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#!/bin/sh exec /usr/bin/cli /usr/lib/cli/libzeroc-ice3.5/iceboxnet.exe "$@"