Rather than a 1 Dec box, I do a big fill yourself advent calendar, which will probably fill people here with horror as it includes things like Christmas PJs, Socks, Christmas sylvanian families, crafts, maileg mice etc.
I don't see the point of waiting to christmas day to give them all the christmas themed toys etc to play with and think it lets them encourage the christmas period.
I also do a christmas eve box with our traditions - book, santa plate, key, bell and I add hot choc, a little craft, some sweets and socks etc.
My daughter is very spoiled (with attention, love, gifts) I will fully admit but she is the most well behaved, polite, kind child. So getting lots of things/attention does not equal 'brat' - I would more equate that to poor parenting than getting a new pair of PJs!