He was responsible for creating some rare but interesting damaged in the postal service covers when one of his bombs misfired in the mail holding area on an aircraft.
He also made any package with coil Eugene O'Neill $1 stamps suspect.
I will add some of the postal history when I get the images.Damaged mail example--

A unexploded bomb package show from the National Postal Museum--

Note the signature Eugene O'Neill coils usage.
And a cover letter for the items--
