It is shown on this site - http://www.cheatcc.com/ps3/metalgearsolid4gunsofthepatriotscheatscodes.html
First you need to play the levels to collect the items.
Pure silver or solid silver is almost a perfect metal. Regular silver is a sliver with other metals added to to increase the luminosity of the silver.
There are no game cards but Bonus or Collectors items are available by typing /bonus
Gold is a relatively unreactive solid metal because it doesn't easily corrode or tarnish in normal conditions. This property makes gold desirable for use in jewelry and other decorative items.
There were two "treasures" (bonus items) in Poptropica. They are no longer available. For the list, and any current bonus items, see the related question.
Obtuse means that an object is not clear at all and is a solid color. Items such as wood, metal, and bricks are obtuse.
There are no rewards for beating Metal Gear Solid 2: Sons of Liberty with 30 dog tags. For the Tanker Chapter, you can collect 33 dog tags for the Infinite Ammo Bandana, and 78 dog tags for Stealth Camouflage. In the Plant Chapter, you can collect 100 dog tags to get the Brown Wig, which gives you infinite ammo, 120 dog tags for the Stealth Camouflage, 170 dog tags for the Orange Wig, which gives you an infinite hanging meter, and 218 dog tags for the Blue Wig, which gives you an infinite O2 gauge.
The brand that makes the best camouflage seat covers is the Coleman brand. Coleman is the industry leader in providing gear that is used for hunting and as a lateral business move has added many accessory items in the camouflage design. The camouflage seat covers is a new addition to the Coleman outdoor gear brand and that is where the items can be purchased.
No, they do not affect play in any way.
EPFTREASURE!
You can get a stolen mail truck which is a bonus item on Mafia Wars and you can buy some using reward points. You also can get more items when you reach level 99.
Silver filled refers to a metal product made by bonding a layer of silver to a base metal core. The layer of silver is typically thicker than silver plated items, but not as thick as solid silver pieces. This makes silver filled items more affordable than solid silver while still having a higher silver content than plated items.