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Won't answer all of them, but knocked out quite a few questions for me.
Also not a complete answer, because it's not always an option.
♥♥♥♥♥♥♥♥.
The only way to "check" a key is by trying to use it -- which will either tell you it's an invalid key, an already used one, or -- if neither of these -- it will redeem the key.
But sure, send your keys to a "key checker". They will gladly take them.
that guy is a dev, a dev of what Valve mostly defines as fake games.
dunno why he brings developer tools as arguments in a users forum though