What happen if someone ship something illegal to your house and you didn't order it?

This is a good and valid question.  If you open the package, you are in legal possession and can get arrested for it.  But the law abiding citizen could avoid criminal liability by refusing delivery or reporting and turning in the contraband the moment it is received.

Your Question is vaguely worded and by reading most of the replies to your Q, it appears details such as IF "someone, already has, or is planning on shipping something illegal.  😉😏🤫

I'm taking this as meaning that "someone" hasn't actually shipped "something" to your house as of today. 👝📨📮🚤🛥📦✈🛩🚚🚛🚩📮📫📪🏡🚪🚩🚨🚓

However, you'd like to know if something illegal were somehow shipped to your house that you didn't order, would you get in trouble?If you didn't order anything illegal then how would you know that the item shipped was illegal? 🤔😏😕📦 Also that could mean you are aware "something" illegal  was shipped, or is going to be shipped to your house and if found out, would you not be held accountable seeing how you didn't order that illegal item.

If an illegal item is sent to your house whether you ordered it or not, depending on just how high a level of a crime the illegal product is, would factor in what trouble you'd be facing.Now, if you could prove beyond a reasonable doubt that you absolutely had nothing to do with that package, no knowledge or ties to whoever ordered the illegal package, and upon discovering the package held something illegal you immediately notified the authorities, you'd still be grilled and treated as being involved until you were cleared as a suspect...

Tell the police.              

Take the package to the post office and tell them you did not order it.

Return it! or turn it over to the authorities. Don't get mixed up in law breaking. Piece of mind is priceless.

Free drugs or guns, yeah! 

You call the police and report it.

You notify the Police as soon as you become aware of the "illegal" package OR the Police track it and they notify YOU in very loud voices.

It isn't uncommon for drugs dealers to ship drugs to other people's addresses, then watching to see when it get delivered so they can scoop it up.  If you have a package on your porch with your address, and didn't order it, I'd call the cops. 

The FEDs will try and prove that you ordered it. Especially if it has your name. Druggies order gear in a fake name then go round and ask for the parcel saying it was sent to the wrong address by mistake so the FEDs may watch the house for a few days. If nothing can be proven they just take it away.