So far I have:
Trick Staff (><)
Treat Staff
Pumpkin Head II
2 Jack-o-lanterns
Rumors I heard:
-1 equippable item per game day (starting at 0:00, so you can supposedly get one at 20:00 and then another 5 minutes later at 0:01 or something)
-Latent effect on treat staff is during battle (hear combat music)
-Trick staff is junk
-Trick staff II has 10 charges of warp, and you must have had it equipped 30 seconds for warp to be usable. You cannot get more than 10 uses.
-Treat staff II has 1 charge of warp, but it recharges itself every 5 real life days. Like the trick staff II, you must have had it equipped 30 seconds to use Warp.