The rewards can't be deleted from the catalog, like Play mentioned. They're given to you as a gift for purchasing Sims 3 packs. These rewards are downloaded automatically into your game.
To find these rewards go to:
Build Mode > Search by Function > Lighting - to find the lamps
Build Mode > Search by Function > Decoration - to find the Freezer Bunny/Llama
If you've deleted them from your save game, take the steps above to find them and have your Sims household by them again.