  Owing to a renewed interest in flat space higher spin gauge theories, in this
note we provide further details and clarifications on the results presented in
arXiv:1107.5843 and arXiv: 1209.5755, which investigated their locality
properties. Focusing, for simplicity, on quartic amplitudes with one of the
external legs having non-zero integer spin (which can be considered as a
prototype for Weinberg-type arguments), we review the appearance of $1/\Box$
non-localities. In particular, we emphasise that it appears to be not possible
to eliminate all of the aforementioned non-localities with a judicious choice
of coupling constants and spectrum. We also discuss the light-cone gauge fixing
in $d=4$, and argue that the non-local obstruction discussed in the covariant
language cannot be avoided using light-cone gauge formalism.
