Look here if you have bought revoked gifts:

1. Accounts listed above includes the owner of this account and one of his alt. trading account.
2. If you have bought revoked gifts, contacting the seller via these accounts for resolution is more effective than contacting Dispenser.tf.
3. If needed, these are the accounts to be reported to Steam support.

How to use the Shop:
1) Choose what you want to exchange, buy or sell.
2) Put your Trade Offer URL at the bottom of the page in the "Trade Offer URL small window".
3) Click Purchase.
4) Accept the Trade from your Steam account.