Depends on what you are called 'decent sized' (do not post the amount by the way), LE can be unpredictable at times, normally nothing happens, sometimes a letter gets sent and on the odd occasion they will put you under surveillance, attempt a CD etc. Best thing is obviously not to get caught, have safe delivery arrangements and ensure you leave no incriminating evidence anywhere that could be used to link you to the order. It also depends on if you are importing a trafficable quantity across international boarders. Ultimately if anyone comes asking questions, you say nothing and lawyer up.