Range is a bit large, but should be fine since the current owner won't be re-selling.

Sale #1:

https://backpack.tf/profiles/76561198197338561#!/compare/1509926400/1510012800

Sold for SBTWC Phantom (270) + Knifestorm Bonk Boy (260) = 530 keys

Bonk Boy mini:

https://backpack.tf/suggestion/5a03ef6a44325a49405b706d

Sale #2:

https://backpack.tf/profiles/76561198071805624#!/compare/1507593600/1507852800

Sold with HOUWAR (70) for DBD Antlers (410) + Aus Pro Wrench (23) = 365 keys

DBD Antlers mini:

1. https://backpack.tf/profiles/76561197961465738#!/compare/1508803200/1508889600

Sold with HG Laugh for Harvest Rack - better used for the rack

2. https://backpack.tf/profiles/76561198079291517#!/compare/1502928000/1503187200

Sold for PE Mohawk (320) + 72 Victory Lap (77) = 400 keys (rounded)

3. https://backpack.tf/profiles/76561198073553007#!/compare/1502755200/1502841600

Sold for Terror-watt Antlers + 300 keys - B/O was 420: http://www.tf2outpost.com/trade/29315423

Caps at 420 keys easily

Taking 400-420

Previous sale of ~350 keys (credits to Sprekt).

Taking 350-530 keys as the new range.