There are three instances of this item being sold currently, one being dirty and the other being duped. The item has not been updated for nearly 2 years and it is due for a shake up and a re-examination. I believe a 25-27 key range is acceptable due to the current prices of 24, 25 and 30 keys.

http://backpack.tf/u/76561198080179568 - Duped for 24 keys

http://backpack.tf/u/76561198076020691 - Clean for 25 keys

http://backpack.tf/u/76561198090956917 - Dirty for 30 keys

It might also be wise to note that all 3 sellers appear to be pro sellers.