Long train incoming.

Sale 1

Sold with a key for a SKS Aussie Minigun (mini at 19)

http://backpack.tf/profiles/76561198145565961#!/compare/1471651200/1471824000

http://www.tf2outpost.com/trade/28407393 ----- No B/O

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Mini for the Minigun: Sellers for 19 keys

http://imgur.com/a/E969N

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=======> 19 - 1 = 18 keys

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Sale 2

Sold for a Steaming Stove Pipe (mini at 11) + ~10 keys in sweets

http://backpack.tf/profiles/76561198145565961#!/compare/1473120000/1473465600

No Outpost trade.

Big history gap on buyer's side, but near ID matches with all items.

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Mini for the Steaming Stove: Sold for a Stormy Dread Knot (seller for 9) + 2 keys

http://backpack.tf/profiles/76561198141816516#!/compare/1472947200/1473033600

http://imgur.com/a/eIzYz ----- Knot seller for 9 keys

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=======> 11 + 10 = 21 keys

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Sale 5

Sold for 17 keys (sort by time)

http://backpack.tf/profiles/76561198072326844#!/compare/1475020800/1475107200

http://www.tf2outpost.com/trade/28513206 ----- B/O was 17 keys, relisted from here: http://www.tf2outpost.com/trade/28508755

=======> 17 keys

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Sale 4

Bulk

http://backpack.tf/profiles/76561198138671383#!/compare/1474761600/1474848000

No Outpost trade.

=======> Not using

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Sale 5

Probable quicksale/bulk

http://backpack.tf/profiles/76561198020674825#!/compare/1471737600/1471824000

http://backpack.tf/profiles/76561198071836866#!/compare/1471651200/1471737600

http://www.tf2outpost.com/trade/28421303 ----- B/O was 20 keys, was up for a while.

=======> Using the B/O

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Sale 6

Bulk

http://backpack.tf/profiles/76561198020674825#!/compare/1471910400/1471996800

http://www.tf2outpost.com/trade/28435368 ----- B/O was 18 keys, but sold quickly.

=======> Not using

======================================================

Sale 7

Bulk

http://backpack.tf/profiles/76561198061376237#!/compare/1474416000/1474502400

http://www.tf2outpost.com/trade/28474827 ----- No B/O

=======> Not using

======================================================

Sellers

- No sellers at the time.

Summary

- Sales for 17, 18, 21.

- Valid B/O of 20 on a bulk sale.

I'm going to cap the highest sale and go with 17-20 keys. Criticism appreciated!