thefounders233's Inventory list could not be downloaded. This is either because Steam is down or because their inventory is private.
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There are a lot of imitation phishing sites and so-called item generators out there, and the safety of our users takes priority! If you see this message when you thought you were going to a genuine website, you probably weren't...
Alternatively if the site actually is legitimate, open a ticket and we'll whitelist it.