Missing dog teddy

I had a dog teddy for years. My grandma got it for me. It was the last thing she gave me before she passed away. I let my boyfriend have it at his house because I thought it would be special. Only problem is now he has lost it. It's either at my house or his house. I looked everywhere in my house and I can't find it. My boyfriend is determined that it is at my house but it can't be. My boyfriend literally refuses to believe that it could be at his house so he refuses to look. Now my dog teddy is gone and it upsets me so much.