Counter.

Sale 1: http://backpack.tf/profiles/76561198003935476#!/compare/1487980800/1488067200

C9 Pampered Pyro (18 keys) + Scorching Woolen (350 keys)

350 + 18 = 368

Sale 2: http://backpack.tf/profiles/76561198020674825#!/compare/1485648000/1485734400

Scorching DCO + 42 Pure for Hearts Crones (483 keys) + PE Beak (160 keys)

483 + 160 - 42 = 601

PE Beak mini:

http://backpack.tf/profiles/76561198068732040#!/compare/1488672000/1488758400

Sold with a DBD Rack(180) for a Beams Rack(335).

Bulk but supports.

http://backpack.tf/profiles/76561197967470975#!/compare/1488499200/1488585600

Untrace.

http://backpack.tf/profiles/76561198052449359#!/compare/1483315200/1483833600

1:1 with a Vivid Peak(160)

Bulky, I couldn't find any other sales though.

Calling it 160.

Sale 3: http://backpack.tf/profiles/76561198036027738#!/compare/1488412800/1488499200

Sold with 5 pure for GE BOA (525 keys)

525 - 5 = 520

Sale 4: http://imgur.com/a/rxqqm

PE Well Wrapped (260) + Beams Hoodie (74) + G. Fetti KE (75)

260 + 74 + 75 = 409

Sale 5: http://backpack.tf/profiles/76561198057412106#!/compare/1492992000/1493078400

Sold for 2x Tesla Laws (2 x 241,5 = 483 keys) + 27 pure

483 + 27 = 510

Sale 6: http://backpack.tf/profiles/76561198095565086#!/compare/1493078400/1493164800 - 440 keys

Mini for VVF: http://backpack.tf/suggestion/5901f984c4404544e5020cdb - 250

Sales at 368, 601, 520, 409, 510 and 450. Going with a range of 410-520.