What’s everyone’s Christmas wish from the final Greg’s farm Advent box?

[Fry89]

First, how could this possibly be more than a BIG GUESS?

AND

If you didn’t want to SPOIL it, why would you post it?

Yes, it is a big guess but based on observation. So far they gave players two beautiful new seasonal decorations out of three, it's not that hard to guess that they are going to give the last new deco in one of the remaining gift boxes.
About your second question, somehow it's not a spoiler if it's based on an assumption.

[CottonTail]

I'll be happy as long as it's not a booster (unless it's a very good booster ).

[Patty]

Keep the ice sculpture, I want a dozen potted Christmas trees please. I have to admit I’m a bit miffed that most older decos are available to purchase yet the one item I especially want seems unavailable. I did manage to win ONE in this event.

[venusioso]

An "L" bot free game

[DeonTri]

An "L" bot free game

Venusioso... sorry to tell you this, but there really isn’t a Santa... so, nop, this ain’t gonna happen

[PittyPoo]

I want a fixed personal train��

[BostonGirl]

I’ll take whatever’s in the box. I’d like his shop to have 10 bolts in every slot. Thank you. 😊😏😄

[midwestgurl]

I wanted the candy cane swingset

[Bestajunior]

You can open the advent calendar for the next day when Alfred comes with the mail.

Hint: it’s going to be a disappointment, no barn or silo uograde. Sadly so.

[mdcfc]

Not a frozen sheep!