Upper Bound Restriction:

http://www.tf2outpost.com/trade/19604338 He wants 7.

http://www.tf2outpost.com/trade/19812404 He wants 7 (120 keys).

Sales:

1. http://www.tf2outpost.com/trade/19791775 This was bought with a Power Surge Tough Stuff Muffs, as documented here (what I'm counter-ing). http://backpack.tf/vote/id/5378a4c74cd7b819618b494c d0 had been recently working on those. http://backpack.tf/vote/id/5357a28c4dd7b889788b4aa3 I'm not using this as direct evidence but simply to prove that they're not worth more than 7. http://www.tf2outpost.com/trade/19262271 He wanted 7 for them.

2. http://www.tf2outpost.com/trade/19783392 Sold for 6.8 very quickly. It had sold within 8 hours. http://www.tf2outpost.com/trade/19787903

As for the Muffs: on d0's last suggestion, BPB suggested that they're close to 6.5.

Would you prefer 6.5-7 or 6.8-7? I'm happy either way.