Sales look solid for your first attempt, but the hat you suggested is still updated in price (the hat is a month old), we usually update unusual prices if is more than a year outdated.

Additionally, looking at the classifieds, the buy orders are under 29 keys (see screenshot posted by Magik), when doing the low and high end of price ranges, we need to consider the buy and sell orders, so your suggested low-end of a range should be above quickbuying price. While the high end is determined if sellers can sell their unusual at the listed price.

Also, for sales 1 and 3, like Magik said, label them with sentences like "traded for 29 pure" or "Sold for 28 keys +sweets", just for convenience and clarity. You can use marketplace.tf for evidence as well, but there are none sold on the market for this hat, so is fine.

Looks great! If you want to understand more, you can take a look at accepted price suggestions at the front page.

Cheers!