I'm not a lawyer, but that sounds a little dicey to me. I think for getting search warrants, you need probable cause to believe that somebody has a specific amo

I'm not a lawyer, but that sounds a little dicey to me. I think for getting search warrants, you need probable cause to believe that somebody has a specific amount of a specific drug or other contraband, ideally in a specific place. Claiming on an anonymous website that you lost some amount of money on a site known for trafficking mostly contraband sounds more like a fishing expedition - you have no way to tell if they were lying entirely, or what they supposedly lost money on, or if it's actually illegal in their jurisdiction. You generally can't, or at least aren't supposed to be able to, get a warrant based on a hunch that somebody is doing something illegal. This is perhaps cause to open an investigation on somebody, but I'd think they'd have to actually contact these people and complete a sale for something illegal to move forward with legal action. Which would probably not be worth the trouble for most agencies capable of doing that sort of thing, unless they had reason to believe that you were a pretty big fish.