Has anything ever been observed coming into existence ex nihilo or does everything in existence appear to be reconfigurations of things already in existence? "

Has anything ever been observed coming into existence ex nihilo or does everything in existence appear to be reconfigurations of things already in existence? "The universe" is not an answer because information about causal events prior to a configuration space capable of recurrent relationships is inherently unrecoverable not non-existent. (Unobservable =\= causally impotent.)