> 
> A: その封筒を開けると、便箋一枚の手紙と一万円札２枚が出てきた。
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> 

My translation:

> 
> A: If that envelop is opened, one sheet of letter paper and 2 sheets of 10 thousand yen bills 出てきた.
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> 

In my understanding, ～てきた represents 

* action done in the past and it continues up to the present, "~started to, ~has begun to, etc". For example,

	+ 雨が降ってきた。It started to rain.
	+ 人口が増えてきた。The population has begun to grow.
* after doing the ～て action, the speaker return to the place where she/he says the sentence.

	+ 親を連れてきた。I brought my parents here.
	+ 弁当を買ってきた。 I bought a meal and came here with that meal.

But in the sentence A, I think the usage of ～出てきた does not make sense so ～出た should be used instead.

Question
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What is the meaning of ～てきた in the sentence A?