This was answered in this
Herald post, which points to
this document.
The expired writ will not be deleted. It's a normal blessed item, and can decay or be lost like any other normal blessed item, but it won't just vanish after 30 days.
I hope that at the very least,
"IF" the deed has been already used to place a House on the pertaining plot, the deed will, as I said, at the very least, become
account bound and not tradeable to other accounts.
I can understand and accept the idea that players might want to keep a "souvenir" of their win in Magincia, but that this becomes yet another rare to sell for tens upon tens of millions of gold honestly, I think it would be too much and a slap in the face to all those players who were not as lucky.
Not only one got lucky to win the plot and place it, but they would also gain on top of it a new rare sellable for tens upon of tens of millions of gp ??
As I said, I am all fine that it stays once the House has been placed, but only if at that point this particular item is made "account bound" and not tradeable.
Of course, until the deed is actually used to place a House on the winning plot, it will instead keep being tradeable just fine.
Can you please Phoenix_Mythic comment on this ? Thank you very much.