Most recent sale:

• bp on 2-1: http://backpack.tf/profiles/76561198047821985?time=1422777600 - 3 in bp
• bp on 2-19: http://backpack.tf/profiles/76561198047821985?time=1424332800 - 2 in bp

Edit: buyer's bp has much better history

• bp on 2-4: http://backpack.tf/profiles/76561198064474599?time=1423036800 - none in bp
• bp on 2-5: http://backpack.tf/profiles/76561198064474599?time=1423123200 - 1 in bp

I think he left out 1 ref because he wasn't sure when the wrangler was sold.

That trade is pretty old and we don't know when he sold it. If it was recent than you can use it but if it was a year ago it could be invalid.