Earlier quoted context omitted.
> Unfortunately if you really need genuine products you simply cannot buy things off Amazon anymore. That is a very generalized statement. I have bought hundreds products shipped and sold by Amazon and never had an issue with authenticity. I'm sure it happens, but I'm willing to guess it is pretty rare and Amazon has always been quick to refund products that are shipped and sold by Amazon.
My own experience of counterfeits includes, of all things, water filters. The packaging was perfect, but the filters literally wouldn't fit without modification. I gave up after the third time and went back to buying from brick-and-mortar, and haven't had a problem since. Between my experience and reports from others, I'd say that you've been extraordinarily lucky.
Other gear (filters, nose cusions, tubing) looks more or less authentically packaged correctly.