There's probably more recent sales

No proof, please close this and read here on how to create an unusual price suggestion:

http://forums.backpack.tf/index.php?/topic/6033-guide-for-unusual-price-suggestions

What is wrong with your price suggestion?

1. No compare links, screenshots or proof that the trade happened.

2. You can't have range with 1 sale you take the middle value of the unusual it has been traded for.

3. Minis are needed if the unusual is outdated (ie the peak)