Looks like it can get more. Proof. Irrelevant trades on outpost (in sets/exchanging) are not included.

http://www.tf2outpost.com/trade/8734757

- B/O 1 ref or exchanging

- Unsold

http://www.tf2outpost.com/trade/8469498

- Exchanging

- 0.38 ref offer

http://www.tf2outpost.com/trade/8754343

- B/O 1 ref

- Unsold

http://www.tf2outpost.com/trade/8384829

- No B/O

- 0.38 ref offer

http://www.tf2outpost.com/trade/8437640

- B/O 1.11 ref

- Unsold

http://www.tf2outpost.com/trade/8472984

- No B/O

- 0.38 ref offer

http://www.tf2outpost.com/trade/7835750

- No B/O

- 0.38 ref offer

http://www.tf2outpost.com/trade/6979128

- Exchanging

- 0.44 ref offer

http://www.tf2outpost.com/trade/7410552

- No B/O

- 0.66 ref offer

http://www.tf2outpost.com/trade/4256486

- Out of stock, 4 months

- But sold at 0.55 in since then

http://www.tf2outpost.com/trade/5385419

- No B/O

- Best offer 0.77 ref

- Probably sold at 0.77 ref as it is not in his BP and trade not bump since the offer

http://www.tf2outpost.com/trade/7331975

Successful at 0.33 ref.

http://www.tf2outpost.com/trade/8693550

Unsuccessful at 0.33 ref, 2 days.

http://www.tf2outpost.com/trade/8668471

Unsuccessful at 0.38 ref, 3 days.

http://www.tf2outpost.com/trade/8703037

Unsuccessful at 0.33 ref, new.