After the duration of a charm or compulsion effect (such as Charm Person or Suggestion) expires, does the subject become immediately aware that they were under such an effect?
If so, doesn't this seem a little counter-intuitive for the more subtle spells like suggestion? ie. "If you give me the key, I'm sure it'll be worth your while *wink*". As the spell ends when the deed is done, would they attempt to take the key back, or would they continue thinking that the suggestion was reasonable?
Additional question: If a spellcaster identifies a charm spell as it is being cast on him (through Spellcraft), and he fails his save, is he aware that he is charmed? Since he retains autonomy (Merely interpereting requests in the most favourable way), would he be free to dispel the magic on himself if possible (Through the use of break enchantment/dispel magic)?
The effect on the target's attitude is called out as having a duration. When the duration ends, their attitude is no longer effected. No memory effects are (generally) noted, so if they were aware they were enchanted, they would recall being so. Just as a hostile monster would continue attacking after Charm Monster wears off, so would the NPC with the stolen key take appropriate action to recover his/her property if possible.
As to your other question, the caster obviously wants the spell in place, and why would the subject try to foul up the plans of this nice person who is clearly his best friend in the world?
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The subject remembers his actions (barring further magic to change this). If they were particularly strange, out of character and against his best interest, he might well suspect that something placed an influence on him. If he has some way of knowing a spell was cast on him, he remembers that too.
When the duration of suggestion ends, the subject is no longer compelled, so if he would normally think the situation is out of whack, he'll take action to recover his own interests. It's possible that the subject has no particular objection, in the situation described, to giving someone the key in return for a reasonable bribe (which he received) and is not disturbed to remember deciding to accept it.
A charmed spellcaster might know he has been charmed. He interprets the action in the best possible way. Unless the spell is directly harmful to him (which might lead him to point this out politely to his new friend) he thinks there is a good reason for the spell - maybe even the actual reason, that it benefits his good friend and prevents the subject from doing him harm.