I didn't see Inside EVs (or anyone else) cover the new changes to CA's HOV stickers. The article below is a little old, but Gov. Brown apparently signed the bill. Basically, CA is moving to a three year expiration of the HOV stickers. I guess it had to happen eventually. https://ww2.kqed.org/science/2017/09/15/ca-legislature-clean-cars-can-keep-carpool-lane-access/
I guess this means all the gen 1 Prius are going to be for sale very soon. Those yellow stickers are gone and they don't qualify for green or white.
The yellow stickers have been expired for 7 or 8 years. This sucks for people who rely on the sticker and don't like to buy a new car every three years.