Soft theorems from boundary terms in the classical point particle currents

Soft factorization has been shown to hold sub-leading order in QED and sub-sub-leading perturbative quantum gravity, with various loop non-universal corrections that can be found. Here we show all terms factorizing at tree level uniquely identified as boundary exist already the classical expressions for electric current stress tensor of a point particle. Further, one cannot identify such beyond or orders respectively, providing evidence "universality" soft factor only holds these orders. Finally, out amplitudes expected, theory where gravitons couple scalar field.