Eerie Crates were introduced in the October 26th, 2012 Patch. These crates can only be unlocked by using a Eerie key, which can be bought at the in-game store.
the contents in this crate, if there restricted to Halloween, and the percentage of getting them is:
Sir Hootsalot -------------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Master Mind --------------------- 4.50% - Restricted to Halloween/Full Moon Events
Rump-o'-Lantern --------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Scarecrow ----------------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Crone's Dome ------------------ 4.50% - Not Restricted to Halloween/Full Moon Events
Executioner --------------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Bonedolier ---------------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Plutonidome -------------------- 4.50% - Restricted to Halloween/Full Moon Events
Spooky Shoes ------------------ 4.50% - Not Restricted to Halloween/Full Moon Events
Spooky Sleeves ---------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Zipperface ---------------------- 4.50% - Restricted to Halloween/Full Moon Events
Boo Balloon --------------------- 4.50% - Restricted to Halloween/Full Moon Events
Unknown Monkeynaut -------- 4.50% - Restricted to Halloween/Full Moon Events
Grand Duchess Tutu ---------- 4.50% - Restricted to Halloween/Full Moon Events
Grand Duchess Fairy Wings - 4.50% - Restricted to Halloween/Full Moon Events
Grand Duchess Tiara --------- 4.50% - Restricted to Halloween/Full Moon Events
Dead Little Buddy ------------- 4.50% - Restricted to Halloween/Full Moon Events
Exorcizor ------------------------ 4.50% - Not Restricted to Halloween/Full Moon Events
Voodoo Juju (Slight Return) - 4.50% - Not Restricted to Halloween/Full Moon Events
Wraith Wrap ------------------- 4.50% - Not Restricted to Halloween/Full Moon Events
Coffin Kit ------------------------ 4.50% - Not Restricted to Halloween/Full Moon Events
Bat Outta Hell ------------------ 4.50% - Restricted to Halloween/Full Moon Events
