It says delivered but I don't have my package
Then the post office has it. Go there tomorrow and ask for it.
You should understand the process.
If you have an item that it's intercepted what happens as the item gets delivered, and your package will show that it's been opened and taped Shut by a federal employee
Inside of the package will be a letter
The letter is they're to inform you that the interception has happened
It will then tell you that you can send your package if you prove that you have the legal right to have the product
The most cases they ask you to provide a doctor's prescription, or your certification to show that your medical professional or researcher that has a legal right to purchase the item.
The other options are to do nothing, which I highly recommend or to write them back and admit that you made a mistake which I do not recommend.
This is what's known as a love letter. It's slang used on the internet because the government loves you don't you know.
If they wanted to get you, they have delivered you an item with a letter inside of it.
And this case that's impossible, because this is an item not coming through customs which means that no one can open it because it's coming from inside the United States to another American address.