I've Got a Chocolate. What a Taste!

A The doorbell ringed rang.
It was an ordinary-looking postbox package/box/parcel (postbox is another word for mailbox) sent from Germany.
Not a second was needed Not even a second had passed until before I noticed realized/guessed ("noticed" implies that you saw the label stating it was from your aunt rather than coming to that conclusion on your own) the box that's came/was from my aunt living in Germany, even without scanning over the name to know see who it is was from.

She sometimes but periodically sometimes/periodically (one or the other, it is redundant to use both) sends my family a box stuffed with German crackers, snacks and other miscellaneous items. I think she is dying to miss misses Korea to death. Dying to ____ means you desperately want something, in this case you are saying your aunt can't wait to miss Korea

Anyway, here's the deal!
(Sorry for traveling all over the world before I spit out the point on of/in this notebook)There is nothing technically wrong with what you said here, but it sounds a bit odd and unnatural. Sorry for skipping around before I get to the point of/in this notebook or Sorry for going on and on before I get to the point of this notebook would be a bit more natural to hear in conversation. 

The box's got box contained a tiny but premium chocolate box (box of chocolates is more clear, but chocolate box is not necessarily incorrect) for my birthday present!
It reads read (The rest of the story is told using the past tense, so you should continue using that same tense when referring to the story. Shifting tenses is confusing, so grammar rules emphasize consistency.)  "Lindt - Herzlichen Gluckwunsch" (I don't know what it means completely..is there someone who knows German?)

Different from Contrary to the photo below,
I have already picked up some pieces and dropped eaten them one-by-one to enjoy as much flavor as I can.
I definitely love the moment when they melts on my tongue with a mouthful of milk. This is one of the best couples I've ever tasted.This is one of the best combinations I have ever tasted. (I assume you mean milk and chocolate together are one of the best "couples" you have ever tasted. Generally when you use the word "couples" it is assumed you are referring to people, it sounds unnatural to use it in reference to food)
(But I'm not as greedy as it may seem, trust me. lol)
Does anyone need to taste it? I just ate have only eaten three pieces yet so far!

I've Got a some Cchocolates. What a Taste How tasty!

A The doorbell ringed rung.
It was an ordinary-looking postbox parcel (postbox is where you put letters to be sent，ie： I put it in the postbox and hoped it would arrive in time. )sent from Germany.
Not a second was needed until I noticed It didn't even take me a second util I realized the box that's was from my aunt living in Germany, even without scanning over the name to know who it is.

She sometimes but periodically (sometimes means periodically, you can only use one of them.) sends my family a box stuffed with German crackers, snacks and other miscellaneous items. I think she is dying to missing Korea. (If you say she is dying to miss Korea it means she is not missing Korea but wants to miss it!）

Anyway, here's the deal!
(Sorry for traveling all over the world rabbiting on before I spit out get to the point on in this notebook)

The box's got In the box was a tiny but premium chocolate box box of chocolates (If you say  chocolate box you mean a box made of chocolate.)for my birthday present! 

It reads "Lindt - Herzlichen Gluckwunsch" (I don't know what it means completely..is there someone who knows German?)

It is Ddifferent from the one in the photo below,
I've already picked up some pieces and dropped eaten them one-by-one to enjoy as much flavor as I can.
I definitely love the moment when they melts on my tongue with a mouthful of milk. This is one of the best couples These are a couple of the best chocolates I've ever tasted. (If you say one of the best couples you have ever tasted it means you are tasting a couple-two people lol）
(But I'm not greedy as seen by, trust me. lol)
Does anyone need to taste it? I have only just ate eaten three pieces yet!