You said yourself that it will probably take a week to arrive. It's only been THREE BUSINESS DAYS so far.
You are worrying about nothing. You had no reason to e-mail the seller. Just BE PATIENT.
It should come when it says although post offices eill be busy with xmas and new year so it may come in a day or 2 late :-)
when it arrives has to do with the Post Office ( or whatever service the seller used) and the weather.
we can't predict it with any certainty at all.
It will be there in exactly 4 more days
Nobody reading your question could have a clue - how could they?
so i ordered it 22 december and he said it should be here today or tomorrow will my order be late. i also emailed asking hes top rated and hes said give me your ebay id to i check order when do u think itl arrive