What is this???? Why are they sending me this???

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I have been receiving several mail from UPS. I wonder why they are sending me this... The first time I encountered them was when I was waiting for my mailed check from one of the PTCs I am into... I thought the maile was from them so I wrote them a support ticket. They cleared it out that it was not from them and they aren't using UPS as well... Below is the copy of the first mail I received from them: [b]Hello! The courier company was not able to deliver your parcel by your address. Cause: Error in shipping address. You may pickup the parcel at our post office personaly! Please attention! The shipping label is attached to this e-mail. Please print this label to get this package at our post office. Please do not reply to this e-mail, it is an unmonitored mailbox. Thank you. United Parcel Service of America.[/b] The second mail was almost exactly the same as this... Like they are following it up to me... And the third one, which I received just now: [b]UPS Delivery Problem NR _____ Dear customer! Unfortunately we failed to deliver the package you have sent on the 7th of December in time because the recipient’s address is wrong. Please print out the invoice copy attached and collect the package at our department. United Parcel Service of America.[/b] ALL MAIL have invoice number attachment but corrupted and cannot be openned. And now on the third mail, I have shipped something??? This is totally weird. What is this a scam???