Notice Served is a Document in the Rise of the Tomb Raider: 20 Year Celebration DLC Blood Ties. It belongs to the Atlas de Mornay set and consists of a letter written by Lara's uncle Atlas de Mornay, ordering her to leave the Manor by the end of the week.
This is the document that Lara reads in the intro cut scene to Blood Ties, the letter that starts her search through the Manor in order to find evidence that she is the rightful heir.
The address on the letter is Lara Croft, 142 Abbingdon Road, Guildford, Surrey, England, AL9 5NQ. This address is of course fictional, there is no such road in Guildford. The zip code, though, is that of Hatfield House.
Note that the descriptive text is too long to properly fit into three lines, the maximum space allotted for this purpose.
It is unfortunate that you have forced my hand in this matter, but so be it. As you know, your parents appointed me executor of the estate in the event of their absence. Since your mother disappeared, her death was never technically declared. And given the circumstances surrounding your father's death, it's no surprise that he never drafted a formal last will and testament to account for this circumstance. Unfortunately, you have no legal claims to the estate.
I'm willing to negotiate a modest monthly stipend from your trust, but only if you leave the manor by weeks' end. Don't fight me on this, Lara. Your mother wouldn't want that.Sincerely,