I'm sure your company heard nothing back because the situation you described is perfectly legal in the U.S
Still, in the interest of good communication and flight safety - perhaps a note back to the company saying words to the effect of 'we do not think this warrants investigation' would've been a good thing to do?
Just to have the incident disappear into a black hole neither educates the company concerned into US Ops nor solves any potential safety issues arising from it.