A staff member has replied to your question:
Thank you for contacting Steam Support.
As you have agreed upon the trade by confirming it multiple times, we will be unable to recover any items/gifts that have been traded.
During the trade, the system has you verify and re-verify it if any changes are made to the trade. It is your responsibility to ensure you are receiving the correct items/gifts at the time of accepting the trade.
We will investigate this user and take appropriate action. Please note that you will not receive a notification about any action taken as a result of this report.
If you encounter a scammer in the future, please report them from their Steam Community profile. To do so, click the 'More' drop down, select 'Report Violation' and choose 'Attempted Trade Scam'.
Some examples of trades that you should not agree to are:
- Trading items/gifts for money outside of the Steam Community Market
- Trading items/gifts for CD keys
- Trading items/gifts and expecting them to be returned to you through a verbal agreement
- Trading items/gifts for nothing in return in the first trade and expecting to get an item or gift in a later trade
For more information on our Steam Trading Policy please visit the following FAQ: