I have a 2 and a half year old lionhead bunny named Oreo. He's not neutered(i know i should but i can't seem to get myself to take him). 

When he was 6 months old, he started humping my arm and leg, so I taught him to bump this polar bear that i had. Since then, he and his teddy has been inseparatable, and he holds no interest in other stuff animals. He drags it everywhere around my room, he sleeps next to it and he sometimes even drags it into this litterbox when he is doing his bunny business. And such the teddy gets pretty dirty, but i washes it every few weeks to keep it clean. 

I went on vacation about 10 days ago, and gave my mother charge of my bunny while i was away. I came home today to find that she threw out his teddy because it was dirty. What should i do? He seems depressed and is not very interested in other stuff animals. I went out to a few stores and could not find that polar bear again, and i came home with a puppy and a moose with about the same texture and  shape. He's not even giving them a sniff. 

i'm worried that he would get depressed and stop eating, he's sort of sulking in his condo right now. What should i do? its too late to even dig through the trash to get it back =(

I'd just wait and see - it may be that you are just perceiving that he is depressed. Eventually he may become interested in another toy.

It might be because his scent was all over the old one. Leave a toy in with him and see if he gets more interested as it gets more of his scent

I'm sure he'll adapt to a new toy :-)