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I last sold some puts April 22 when the price was around $469
You mean April 26. Same here: Sold puts March 26, May 5, June 1 (having missed out on your April 22), all when it was in the $460´s.
Re the current situation it´s exactly the other way around: Having confidence in my Price/BV chart (Actually it´s Jim´s chart, as it´s based on former posts from him over the last years) which says Berkshire is on the expensive side I bought puts July 28, August 3 and heavily August 10, with a bit more than half of them closed over the course of the last days.