It could have been a totally random Google glitch, especially since you were never able to replicate it again. Etsy is mostly handmade items and it's also a popular venue for selling vintage finds so most sellers use their own images. Do you happen to remember something about the seller's name? I just did a 'succulents' search over there just to see the images and didn't spot anything suspicious. They do have a copyright infringement policy and can be deleted if found guilty, not something a small business would want to risk.
