Dracaena: Spotlight item at Nook's.
Ivory Piano: Spotlight item at Nook's.
Jack in the Box: Have Jack play three tricks on you on Halloween.
Lafty Lucky Cat: Buy from Redd.
Lovely Phone: Gift from Katie and Kaitli.
Lucky Black Cat: Buy from Redd.
Lucky Cat: Buy from Nook.
Lucky Gold Cat: Spotlight item at Nook's.
Master Sword (The Legend Of Zelda): Spotlight item at Nook's.
Music Box: Gift from Katie and Kaitli.
Piggy Bank: Put 100,000 Bells in bank.
Raccoon Figure: Buy from Redd.
Samurai Suit: Spotlight item at Nook's.
Treasure Chest: Spotlight item at Nook's.
Triforce (The Legend Of Zelda): Buy from Redd.
Washer/Dryer: Buy from Nook.
If you don't know how to already, this is how you time travel:
1) Save and Quit. Then press 'A' when the title screen comes up.
2) Rover will say something like, "It is 6:13 pm in (your town name). Would you like to play?" Some options will come up. Click the bottom option which says 'Other things'
3) Click 'Set date/time' and set it to whatever date and time you want it to be.
4) Then carry on the game. If you go to the next day, dig up the shovel and it will be golden!