You are asking a user forum to confirm a product is genuine. These types of questions are better for sandisk official support. you may want to contact them if you have authenticity questions.
That being said here is some info for you. you have usb 2 ports so the speed you are seeing is normal for the cards.
H2testW results look good.
there are multiple different manufacturing locations. so this is not abnormal.
I would say the cards are likely genuine.
