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Original 2012-2013 S did not have a tow hook. Then one was added with a storage area under the trunk mat. Later the hook was placed into a side pocket in a revised UMC black storage bag (too hard to get under the trunk mat and it changed multiple times with dual drive and then refresh with HEPA/bioweapon).
My Dec 2015 S has one under the frunk mat/liner though it's not obvious it's there. I had a Service Centre guy show me - you have to first pull up the black rubber gasket that fully surrounds the frunk opening, and then you can lift the mat and see the tow hook stowed below