If pins are legal where you are, then why worry. You can go buy them at Wal-Mart if you want (seriously, they are pretty cheap too, though lacking in variety).
The fact alone that you got pins is not sufficent for a warrant to search your home or arrest you, nor will it be enough to convict you. It is circumstantial evidence that you intended to give an injection (which is also illegal in many states if you give it to someone else, unlicenced practice of medicine). If you are busted with AAS or accept a controlled delivery, then yeah, the fact you got pins will probably come up at your trial if you have one, and could hurt you. However, this is probably the least of your worries in this thing of ours.