That's what I had in mind. Cash payments don't require any ID and it's the same with Bitcoin payments. Even if the item gets delivered to your house it's not going to be grounds to prosecute you because you can't be identify as the person who paid for it.
No one is going to look into a one-off occurrence either way, but if have loads of unexplained property coming in to the extent that it's noticeable, problems can arise. That's why programs like "Too Much Bling, Give us a Ring!" exist, to get people to snitch on their neighbors to the tax authorities. If that happens and they do a little digging, they might find out more than you'd like about your unreported Bitcoin activity.