Attitude guarantees replacement if you pay a little extra.
As for discussing the stealth methods.. t-shirt, etc., I wish to god people wouldn't say a word on here about how their stuff was stealthed because the fed is all over this site. If you think they aren't logged into a free site and baiting large scale growers, you're off your rocker. What, you've never been reading a grow journal from 2007 of a guy doing 50 plants and suddenly, right near harvest, it ends? I've seen that plenty. Telling any prying eyes how we're getting our seeds just blows. People trust the internet waaay too much. All it takes is a sniffer to get your ip address / mac address and, having worked tech for a couple of ISPs, I can tell you that ISPs respond to government warrants and subpoenas routinely to provide that information.
I can tell you this, man.. I've ordered 2 times off the web. ENSURE that they will be using US Mail. This seems counter-intuitive, but one of the things US Mail has going for it is it takes a REEEEALLY hefty warrant for mail search. FedEx and UPS don't even need warrants. This is explained on some of the better seed sites, if you do not believe me.
From my experience, Nirvana and Attitude got their stealth just right. Attitude was better, though.
Not only that, but my family uses the items that the seeds were stealthed in!