It's growing because it's happening in a higher and higher percentage of my orders. Plus based on public knowledge of the issue. 4 or 5 years ago, it took serious searching to find other people talking about it. The last 2 years, it's become fairly well known. And is now common.

Some problematic products, I've ordered a couple dozen times and never gotten a genuine product.

>in the same box?

Yes, multiple times, although probably less than 10. And a couple were supposed single seller items. Didn't matter.

(One case initially got my account flagged and couldn't buy anything else until I sent pictures for proof. One of the only times I've ever had Amazon call me.)

However, the much more common occurrence is variance over separate orders.