Last suggestion seems janky. Let's get on that.

SALES:

http://www.tf2outpost.com/trade/26588063 Sold + D@D Festivizer (Unpriced, mini at 60) for Demonflame Phantom (Outdated at 95, mini at 127.5) + 7 keys

((127.5 * 0.9) + 7) - 60 = 61.75 (rounding to 62)

Histories:

http://backpack.tf/profiles/76561198035664616?time=1437894000&compare=1437980400 Seller

http://backpack.tf/profiles/76561198067056647?time=1437894000&compare=1437980400 Buyer

http://www.tf2outpost.com/trade/26525044 Quicksold

Festivizer mini:

No recent sales I can trace, so averaging offers and B/Os... except there's no offers. Anywhere.

The sale from the buyer in the birdcage sale to the next looks higher than 60 keys, but http://www.tf2outpost.com/trade/26748859 Has a B/O of 60 keys.

So using 60 keys.

Phantom mini:

http://www.tf2outpost.com/trade/26415291 Offered 120 before having it stolen

Paid a scorching Belgian (135 after overpay)

Using 120-135.

Only other recent sale was with a scammer, so this looks good to me.

Let it ride.