A new paper is available online if anyone is interested:
Lambert, O., de Muizon, C., Urbina, M., & Bianucci, G., 2020. A new longirostrine sperm whale (Cetacea, Physeteroidea) from the lower Miocene of the Pisco Basin (southern coast of Peru). Journal of Systematic Paleontology 18 (20): 1707-1742. https://www.tandfonline.com/doi/full/10.1080/14772019.2020.1805520
Rhaphicetus is quite unusual for its long rostrum, so it provides new insights into how sperm whales began developing a supracranial basin to house the spermaceti, suggesting that early physeteroids were longirostrine like beaked whales.