Hidden Steam Games Restriction

Recently I trade with a person from Buenos Aires, Argentina and he sent a 'ibb & obb' to me as a gift of his not-yet-tradable Steam game.

When trying to accept the game I have notification as follows:

This is a restricted gift which can only be redeemed in these countries: Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama, Bahamas, Ecuador, Colombia, Venezuela, Peru, Chile, Uruguay, Paraguay, Argentina, Bolivia, Guyana, Suriname, Brazil, Mexico

In addition, if you decide to redeem this restricted gift, you can only play it within the countries listed above. Note that using an IP proxy or other methods to disguise the place of your residence to activate this gift is a violation of the Steam Subscriber Agreement and may result in restrictions on this Steam account.

The problem is that nothing restriction shown when it located on his inventory and so does now on my inventory.
http://steamcommunity.com/id/dang-dut/inventory/#753_1_683763394796351307

Have you encounter this problem and whats your though about this?

Thanks.