Sold at 2.66 ref:

http://www.tf2outpost.com/trade/8137707

Sold at 2.88 ref:

http://www.tf2outpost.com/trade/8176447

Selling at 3 ref:

http://www.tf2outpost.com/trade/8179901

http://www.tf2outpost.com/trade/8174344

http://www.tf2outpost.com/trade/8174987

http://www.tf2outpost.com/trade/8170934

http://www.tf2outpost.com/trade/8164643

http://www.tf2outpost.com/trade/8014931

Unsold for 3.11 ref:

http://www.tf2outpost.com/trade/8133909

Unsold at 3.22 ref:

http://www.tf2outpost.com/trade/8041075 (B/O)

http://www.tf2outpost.com/trade/7937776

Unsold at 3.33 ref/1 key:

http://www.tf2outpost.com/trade/8153497

http://www.tf2outpost.com/trade/8161296

http://www.tf2outpost.com/trade/8134933

http://www.tf2outpost.com/trade/7841264

http://www.tf2outpost.com/trade/8184141

http://www.tf2outpost.com/trade/8146226

http://www.tf2outpost.com/trade/8114594

http://www.tf2outpost.com/trade/7871391

http://www.tf2outpost.com/trade/8187711

http://www.tf2outpost.com/trade/8186334

http://www.tf2outpost.com/trade/8187541

http://www.tf2outpost.com/trade/8162940

http://www.tf2outpost.com/trade/8139909

http://www.tf2outpost.com/trade/8176202

http://www.tf2outpost.com/trade/8165507

Being offered 2.66 ref:

http://www.tf2outpost.com/trade/8043305

Being offered 2.77 ref:

http://www.tf2outpost.com/trade/8071112

Being offered 3 ref:

http://www.tf2outpost.com/trade/8184372

http://www.tf2outpost.com/trade/8145506

http://www.tf2outpost.com/trade/7990740

In conclusion, I can't find any trades with Attendant being sold at 3 ref and above, but 3 ref is still legit as there are ppl offering at that price. Even though there were lots of offers below 3 ref (not added here), but nobody seems to be selling at that price. However, with many yet to be sold at 3 ref and some being sold at a range of 2.66-3 ref, therefore this price range seems to be a legit one.