Even though there has been a number of sales I dont see enough of a variation to make a range.

Sale 1

Sunbeams Killer Exclusive (in date) = Stormy 13th Coffin + 300 Keys

Stormy 13th Coffin = 2800 - 300 = 2500 Keys

Proof:

Before: http://backpack.tf/profiles/76561198039731024?time=1454054400

After (escrow delay): http://backpack.tf/profiles/76561198039731024?time=1454400000

Sale 2:

Stormy 13th Coffin + Cloudy Moon Attendant (duped) = Scorching Brotherhood of Arms + Burning Flames Pyromancer Hood + Showstopper Conga Taunt + Cloudy Moon Beret (duped)

Stormy 13th Coffin = 1500 + 750 + 325 + 95 - 125 = 2545 keys

Close enough to 2500 keys

Proof:

http://imgur.com/a/eajL1

Cloudy Moon Attendant (duped - see mini) = 125 keys

Scorching Brotherhood of Arms (current) = 1500 keys

Burning Flames Pyromancer Hood (current) = 750 Keys

Showstopper Conga Taunt (see mini) = 325 keys

Cloudy Moon Beret (duped - see mini) = 95 keys

Mini Cloudy Moon Attendant (duped)

Cannot find any recent clean sales and the only 2 on Outpost are duped. One has a BO of 150 keys.

When I had it for trade I didn't get any bites at 175 keys and I think 150 keys is too high as well.

Going to estimate it at 125 keys.

Mini Showstopper Conga Taunt

Traded for a Fountain Burstchester - 325 keys

Before: http://backpack.tf/profiles/76561198017584970?time=1453795200

After: http://backpack.tf/profiles/76561198017584970?time=1453968000

Fountain Burstchester price is current.

Mini Cloudy Moon Beret

Wow hasn't been priced in 3 years. Hard to find trades.

Shadow has one with a BO of 175 keys for a clean one but this one is duped.

Going for the average backpack.tf price average for this of 95 keys.