looks like It wasn't random after all, which struck me odd that it wouldn't be since only those at the top after the race were checked which would be too much of a coincidence, and rightly so since they Mercedes and Ferrari where both caught

https://www.motorsport.com/f1/news/fia-originally-only-planned-to-check-hamilton-and-leclercs-planks-at-f1-us-gp/10539962/