This will be outdated in about a week. Let's keep it updated. <3 Three sales at 11 keys.

Sale #1 (March 8th):

Gatsby + 4 keys + Strange Winter Woodsman (1 key) > Smoking Hermes (1.3)

Gatsby: http://www.tf2outpost.com/trade/25070077

Hermes: http://www.tf2outpost.com/trade/25302293

Seller: http://backpack.tf/profiles/76561198021324906?time=1425715200 -> http://backpack.tf/profiles/76561198021324906?time=1425801600

No overpay applied to the Hermes to avoid applying overpay twice.

1.3 - 0.41 (5 keys) = 0.89 buds; ~10.7 keys

11 keys

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Sale #2 (February 14th):

Gatsby > Gifted Australium Blutsauger (1) + S. Crusader's Crossbow (6 ref)

Blutsauger: http://www.tf2outpost.com/trade/25059498

Buyer: http://backpack.tf/profiles/76561198021324906?time=1423900800 -> http://backpack.tf/profiles/76561198021324906?time=1423987200

1.03 * 0.9 = 0.928 buds; 11.13 keys

11 keys

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Sale #3 (February 7th):

Gatsby + Sunbeams Detective Noir + Blizz Dragonborn + ~4 keys in items > TF Logo Muffs

Seller: http://backpack.tf/profiles/76561198133061092?time=1423224527 -> http://backpack.tf/profiles/76561198133061092?time=1423296000

Far too complex to get a realistic value for the Gatsby.

Complex sale

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Sale #4 (January 19th):

Gatsby > Ace's High Bombing Run (12 keys)

Gatsby: http://www.tf2outpost.com/trade/24645101

Seller: http://backpack.tf/profiles/76561198125178172?time=1421568000 -> http://backpack.tf/profiles/76561198125178172?time=1421654400

12 * 0.9 = 10.8

11 keys

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Mini Suggestions:

Gifted Australium Blutsauger:

Blutsauger > 1 bud

Seller: http://backpack.tf/profiles/76561198072122983?time=1424363901 -> http://backpack.tf/profiles/76561198072122983?time=1424419200

1 bud

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Smoking Hermes:

Hermes > Ace's High Defiant Spartan (1.35) + TS Bunsen Brave (~0.5 keys)

Hermes: http://www.tf2outpost.com/trade/25283235

Seller: http://backpack.tf/profiles/76561198139434266?time=1425542400 -> http://backpack.tf/profiles/76561198139434266?time=1425628800

(1.35 + 0.041) * 0.9 = 1.252

1.3 buds

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Support Proof:

Sellers on Outpost selling at a lower value:

http://www.tf2outpost.com/trade/25315525 11 keys, but fairly young

http://www.tf2outpost.com/trade/25179944 12 keys for 1 week

http://www.tf2outpost.com/trade/25163280 12 keys for 2 weeks