Quick/bulk buyers are paying the current price or more. Also, offers are higher.

Quick/bulk buyers

http://www.tf2outpost.com/trade/8159709 4.66ref

http://www.tf2outpost.com/trade/8296677 4.66ref

http://www.tf2outpost.com/trade/4922646 5.66ref

http://www.tf2outpost.com/trade/8455626 5.33ref

http://www.tf2outpost.com/trade/8092899 4.66ref

http://www.tf2outpost.com/trade/8313159 5ref

Regular buyers

http://www.tf2outpost.com/trade/8418868 waterlogged lab coat+1.66ref

http://www.tf2outpost.com/trade/8449308 flunkyware+2ref

http://www.tf2outpost.com/trade/8381282 3keys for 2 cans

Sellers

http://www.tf2outpost.com/trade/8442620 presumably sold for 5.66ref

http://www.tf2outpost.com/trade/8130332 2keys, some people wanted it

http://www.tf2outpost.com/trade/8426137 6ref, some people wanted it, offer of 3ref+flunkyware, offer of 3keys for 2 cans, offer of 3keys+1ref for 2 cans

http://www.tf2outpost.com/trade/8187345 offer of tuxxy, offer of 3.66ref+crafthat, offer of 5ref, offer of 1key+1.66ref

http://www.tf2outpost.com/trade/8273552 unsold at 5.33ref, some people wanted it

http://www.tf2outpost.com/trade/8362911 offer of 1key+1.33ref

http://www.tf2outpost.com/trade/8435967 unsold at 5.33ref

http://www.tf2outpost.com/trade/8202115 unsold at 1key+1.33ref, some people wanted it

http://www.tf2outpost.com/trade/8331527 presumably sold some for 5.66ref(trade of the 5.66ref quickbuyer who was paying 5.33ref at the time)

http://www.tf2outpost.com/trade/8467858 presumably sold some for 6ref(trade of the 5.66ref quickbuyer)

I put the low end as 5ref since a couple of the 5.33ref ones haven't sold, and the high end at 5.66ref since that's what a quickbuyer is paying.