USA here. Amazon certainly sells trash and used items as new. Not every order but every now and then, if you look closely enough, you will see “oh that tape has a fingerprint under it” or something similar. Infamous story of woman getting a box of soiled diapers.
Another complication are the 3rd party sellers.
I’ve gotten used watches, air filters, lights etc. personal health gear, books, and more. Again it’s not the rule but it certainly happens and you have to pay close attention.
Another dark pattern is that you cannot select sold and shipped by Amazon only anymore, which to my personal experience, leads to higher chances of counterfeits.
Had a wedding registry on Amazon once, got some high end knives that immediately started rusting. Realized a lot of the stuff we got was 3 rd party sellers, figured some of it might be counterfeit and I wouldn’t be able to tell until it was too late. Returned hundreds of pounds of cookware, cast iron, etc all at amazons expense.