Last year in Team Fortress 2, there was a random occurrence that you would get a Naughty or Nice Winter crate, which you could unlock with a specific key for that. This year, I have almost a full page of mixed naughty and nice crates, and I did get all of them this year, but noticed that in the shop there was no key for those crates. Are the keys available later or is it just an ordinary key that you buy?
Honestly, I would trade them. Seeing as many people would want them before the keys come out, so they can get unusual hats/strange weapons, I would sell them for about a reclaimed metal each on http://www.tf2outpost.com or http://www.trade.tf. Many people love festive items, and this is time to sell your unwanted crates.