Calm down first of all, I dont know what the deal is in Indiana, but did you get a letter to begin with? If not, dont start worrying, dont get lazy but just calm the fuck down....Your seeds will more than likely show up with no problems unless you ordered them from a total idiot, but the package would literally have to fall apart in transport for you to get caught, it happens but very very unlikely. So just slow down and take a bong rip or 2, they'll be ok.
If you did get a letter, call a lawyer, I'm imagining that Indiana isnt a legal state? Seriously, go buy a high times or go to hightimes.com and look under the legal section for Indiana or better yet go to norml.org and search for a lawyer in Indiana and give them a call and go in for a visit, ask them. If you get arrested do not admit to anything, all you want is your lawyer, matter of fact have a lawyers card ready and just hand it to the arresting officer. I really doubt you'd do any jail time for ordering some seeds dude, but if they are coming to your grow house, as well as got a customs letter, you'd better start doing some cleaning. However, I really hope no one would order seeds having them delivered to their growspot, thats just not a good idea.
But seriously, no letter??? Calm down. They'll show up