Timewarp Birdcage, 8 months old price

This one gave me once again headache.

Recent sold:

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http://backpack.tf/item/1658171820 Sold for

http://backpack.tf/item/1669741683 Power Surge Waxy (~ 1.6 old price, see Mini: ~ 1.4) +

http://backpack.tf/item/3234535674 Spec KS Aussie Frontier Justice (~ 13.5 / 11.25 ~ 1.2) Buds were 11.25 keys at that time.

http://backpack.tf/profiles/76561198048823720?time=1419062400 (after)

http://backpack.tf/profiles/76561198048823720?time=1418976000 (before)

(~ 1.4 + ~ 1.2) * 0.9 ~ 2.4 buds

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Mini Power Surge Waxy

http://www.tf2outpost.com/trade/11801724 C/O: 25 keys, retracted?

Sold for 21 keys pure / 15.5 ~ 1.4 buds

http://backpack.tf/profiles/76561198063905981?time=1416964968 (after)

http://backpack.tf/profiles/76561198063905981?time=1416729600 (before)

Buds were 15.5 keys at that time.

Mini Spec KS Aussie Frontier Justice:

http://www.tf2outpost.com/trade/24886939 B/O: 15 keys

http://www.tf2outpost.com/trade/24908133 B/O: 15 keys

http://www.tf2outpost.com/trade/24882985 B/O: 15 keys

http://www.tf2outpost.com/trade/24879324 B/O: 14 keys

http://www.tf2outpost.com/trade/24877140 B/O: 13 keys quickselling for 2 days autobump

Conservatively 13 - 14 keys.

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http://backpack.tf/item/1658171820 Quicksold for 21 keys pure

http://backpack.tf/profiles/76561198065540412?time=1417593600 (after)

http://backpack.tf/profiles/76561198065540412?time=1417490692 (before)

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Additional Proof (BOs & COs):

http://www.tf2outpost.com/trade/24263789 Taking offers

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Tried my best, any kind of further proof/counter proof is always appreciated. Thanks!