An (almost) Complete Map Collection--and a Call for Help

First, the items:

















Quite a collection, yes?

What's that? One's missing? Yup. That's the problem.

I spent the last couple weeks of Delve feverishly working on finishing my set of 3.1 Elder maps in both Delve and Standard, and wrapped it up a few weeks back with IIRC an Elder Dig map. It was immensely satisfying, and I put the game away to wait for the transfer so I could put the set together as seen above. Well, for various reasons I didn't get to it until 3.5 had already launched...at which point I realized my Elder Ancient City map was missing.

I don't know whether it evaporated in the transfer (it wasn't in a map tab so that can't be it) or if I just ticked it off the list, but I thought to myself, well, okay, finding something to Horizon Orb will be annoying but not impossible. And, indeed, after a couple days, I found someone selling clean Elder Haunted Mansion maps! 3.1, even!

BUT GUESS WHAT? HORIZON ORBS DON'T WORK ON OLD MAPS

So, now, I have an emergency. Does anyone, anyone have a 3.1 Elder Ancient City map for trade? I desperately need to find one or my collection will remain unfinished forever.