Although I don't see anything wrong with the 2017 answer by "A. Ok" (which answered the OP's secondary question about progress being made in experimental verification of Hawking radiation's existence), I realize that it does not completely answer the OP's title question, primarily because of possible differences between sound (whose energetic effects result from interactions between fermions comprising at least part of a massive medium, usually air) and light (which consists entirely of bosons, that differ from fermions in such important respects as their ability to pass through each other). These differences may account for conclusions "within 6 percent" of those hypothesized for the experiment, which seems rather low by scientific standards.
Consequently, I'd like to point out an analysis of observational data that has been rather authoritatively considered to answer the OP's title question: Found in the Mar.2, 2020, preprint of a paper titled "Apparent Evidence for Hawking points in the CMB Sky", by Daniel An, Krzysztof A. Meissner, Pawel Nurowski, and Roger Penrose. it interprets "several anomalous spots of significantly raised temperature" in the Cosmic Microwave Background as Hawking radiation, and appears to have been the decisive factor in the award (on October 6, 2020) of a Nobel Prize, in Physics, to the mathematical physicist Sir Roger Penrose.
The Nobel Prize Committee's report can be found at https://www.nobelprize.org/uploads/2020/10/advanced-physicsprize2020.pdf , or by cutting & pasting its title ("Theoretical Foundation for Black Holes and the Supermassive Compact Object at the Galactic Centre") into any search box. The report includes a short bibliography of some of the related works by Penrose and others.
Regarding the OP's secondary question about energy, virtual particles are made real by the gravitational field of the black hole, as described by Gasperini, Veneziano, and others, with Gasperini's description of the process (as resulting from separation of the members of a virtual particle/antiparticle pair by more than the Compton wavelength during more than the Compton time) available through public libraries (either directly or via inter-library loan) in "Gasperini, M. 1986, PhRvL, 56, 2873". (Although "popular science" texts, such as Appendix A in the 1997 version of Guth's book titled "The Inflationary Universe", often refer to it as "negative energy", and although even Einstein was not particularly fond of the alternative geometrical interpretation that refers to it as the curvature of spacetime, gravity is not consistently considered to be strictly "energy" in the terminology of physics: However, because of gravity's extreme and possibly infinite range, as well as its extreme weakness [with practically any toy magnet able to overcome its strength by lifting a needle from a table top], no boson comprising it is likely to be discovered any time soon.)