Unfortunately this is one of the risks of buying steroids over the internet. If possible try and find you a local source in your city. It is much easier to do business like that, then to always worry about if your shit was tagged and then the police are going to dress up and come arrest your ass when you accept shipment.
It is never good to get your shipment seized, no matter how many people tell you not to worry about it. Don't respond to the seizure letter, and you can try and tell your source to send it to a different address, but I would still be wary that they could be watching you. It does not matter how big or small the package is, obvisouly if it is a really big package they will look to take you down the first time, but if it is a small personal order they will let you get by a few times until they think what a dumbass and just go arrest you once you accept the package.
Again if possible find yourself a local supplier and try not to use the internet too much if ordering steroids. It should take you longer to find reputable people on the street, but if you did, you would be able to put a face to your order, which should cut down on getting screwed over (which is why you must get in with the right crowd). You would also not be wasting money in shipping and handling fees, and any fees for money transfers (Western Union - professional rapists). Much like on here, the right people would be able to guide you into what could help you achieve your goals.