Steam Support will not return any items or gifts that you feel have been traded unfairly. There are no exceptions to this policy. This policy does not include games received in a trade that are revoked due to payment fraud (please see the Revoked Gifts article for more information).
To ensure that a scammer is appropriately handled, and to prevent them from benefitting from this scam or others in the future, make sure that you report them through the Steam Community Reporting feature.
Inventory restorations are granted on a case by case basis. In order for Steam Support to restore items, technicians will need to verify, using Steam’s internal data, that the account was hijacked.
Your account must meet the following criteria in order to be considered for an inventory restoration:
If your items were traded away or sold on the marketplace by an account hijacker, submit a Steam Support ticket with your report.
Ensure that your report contains screenshots of the trades or Market sales in question, as shown here: Listing Trades for Steam Support. Note that any attempt to mislead Steam Support will cause appropriate restrictions to be applied to your accounts.
Steam Support will not return any items or gifts that have been traded, sold or otherwise removed while your account was used by a friend or family member. The use and security of the Steam account and the computer you use are your responsibility.
If a gift is removed from your account due to fraud, the account where the fraud took place will be suspended. Your account will not be suspended; however, the game you received will be removed.
Items will be restored only if the trade was completed using the Steam Trading Interface. Items exchanged in separate trades are not eligible for restoration.
Please see the Revoked Gifts article for more information.
If you are asked to sign into a website using your Steam account, you will be presented with a message reminding you that the site is not affiliated with Steam or Valve.
You should observe the Recommended Trading Practices when conducting a trade with any third party website, just as you would with any other Steam user. For example, you should never trade for anything that cannot be added into the trade window within Steam. Items that are lost or scammed when trading with a third party website will not be restored upon request.
Some trading sites (e.g. lottery/jackpot sites) require you to perform one-sided trades. When completing a one-sided trade we inform you that you are gifting items to the account you are trading with. Items that are gifted to another account through a third party lottery/jackpot website or service cannot be restored by Steam Support. We recommend avoiding trades of this type and by accepting them, you do so at your own risk. See our Recommended Trading Practices for more information on the types of trades to avoid.
Furthermore, any third party website that participates in jackpots/lotteries will likely conduct trades with a large number of Steam users. If a site is found to have conducted trades involving fraudulent or stolen items, the inventory of their trading accounts may be locked, and their accounts banned from participating in trading.
If you believe a third party website has scammed you, please submit a report from the offending user profile.
For more information on Steam Trades and the Community Market, please use the following resources: