DBD BoA:

Sale 1:

https://backpack.tf/profiles/76561198125447760#!/compare/1484956800/1485043200

115 pure

[Taking 115]

Sale 2:

Seller:https://backpack.tf/profiles/76561198073553007#!/compare/1485302400/1485388800

125 keys pure

http://www.tf2outpost.com/trade/28733024

[Taking 125]

Sale 3:

buyer: https://backpack.tf/profiles/76561198165979335#!/compare/1489104000/1489190400

Looks like 91 pure.

seller: https://backpack.tf/profiles/76561198126204929#!/compare/1489104000/1489190400

142 keys added, but from multiple sources inlcuding the buyer

91 < X < 142

[Excluding]

Sale 4:

buyer: http://backpack.tf/profiles/76561198296878368#!/compare/1484438400/1484524800

seller: http://backpack.tf/profiles/76561197982127154#!/compare/1484438400/1484524800

Sold for pro aussie sniper (33) + green black hole mirror (54-59, recent sugg) + p.fetti elf esteem (12, in-date) + 5 keys

no findable B/O: http://www.tf2outpost.com/trade/28710403

mirror mini:

http://backpack.tf/suggestion/58eaf1dbc440452fd1402507

X = 33 + 56.5 + 12 + 5 = 106.5 ~ 107

[Taking 107]

Sale 5:

http://backpack.tf/profiles/76561198103392733#!/compare/1485043200/1485129600

Looks like he cashed out. Tough to say.

[Excluding]

Sale 6:

http://backpack.tf/profiles/76561198121731353#!/compare/1488412800/1488499200

Bulky

[Excluding]

Sale 7:

http://backpack.tf/profiles/76561198055195449#!/compare/1489104000/1489276800

Nothing added. Probably sold the keys he got from Julia.

[Excluding]

Sale 8:

http://backpack.tf/profiles/76561198115160019#!/compare/1489968000/1490054400

Bought for DBD Fruit Shoot (21, in-date) + DBD Trilby (28-35, in-date) + DBD Engineer's Cap (26, in-date) + DBD Boxcar Bomber (88, 1 year ago) + spec.ks aussie wrench (~18.5)

Boxcar mini:

http://backpack.tf/profiles/76561198146212942#!/compare/1488844800/1488931200

With orb.fire gym rat for logo le france

Basically, close to 88. Still caps at B/O.

X = 21 + 31.5 + 26 + (88) + 18.5 = 185

Capped by B/O of 150: http://www.tf2outpost.com/trade/28841093

[Taking 150]

Sale 9:

http://backpack.tf/profiles/76561198095902384#!/compare/1488931200/1489017600

Sold with a HOUWAR (60, in-date) for PE rack (182-210, 11 months ago) + NNB Ten Gallon (19-22, 6 months ago)

Seller's OP for the BoA: http://www.tf2outpost.com/trade/28792531, wiped B/O

Previous trade for same hat: http://www.tf2outpost.com/trade/28766546, B/O 140

X = -60 + ~200 + ~17

Likely caps at 140.

[Taking 140]

Sale 10:

http://backpack.tf/profiles/76561198005273439#!/compare/1489190400/1489276800

Sold for DP BoA (56-65, 7 months ago) + KW Hong Kong Cone (61-70, in-date)

DP BoA mini:

Unsold at 60 for 3 months

Couldn't find any recent sales

Buyers 32-38

Have to call it 60 unless sale proof found.

X = 60 + 65.5 = 125.5

[Taking 125]

Sales of 107, 115, 125, 125, 140, 150

Because the 140 and 150 sales were B/O caps, I'm more inclined to call them outliers.

Unsold at 155 for 29 days; buyers at 98-100.

http://tinypic.com/r/e9xd15/9

Most common point is 125, including 115 due to buyers.

Final range: 115-125 keys.