Any even slightly unusual swell event would be noticed by surfers and surf forecasters. I don't think anything happened in terms of unusual waves in real life, but I'll check some sources. Very interesting nonetheless. The lack of bouys in that area is nothing new. That region is extremely remote, especially for US.
Here are screenshots of what the surf looked like at a fully swell-exposed spot on the SW coast of South Africa the last few days. Nothing unusual happened from April 9 through now.
https://imgur.com/a/QQMB9ez