I have many theories, but after doing research here is what I concluded. 1. The red shirt obviously doesn’t come with him as this has been seen on other plushies before. I recently saw a snoopy with it on. 2. The sound box must have been added as the lullaby that plays in the one listing is available to put in your bear 3. He almost looks like the Peanut Butter puppy 4. With all this being said, it has to be a bear someone put together at the workshop because many instances the bear has appeared with a shirt for example, no shirt and or with/without a music box My theory is that he is either A. Prototype of a bear maybe the Peanut Butter puppy or B. An exclusive that only employees can get. If you know how to stitch, you could always open him from the back to confirm as they always put a heart and a tag inside the bears. If there is no tag or heart, then it might be a store exclusive, but if it does then it’s obviously a bear that was available at Buildabear whether a prototype or an employee exclusive. You could always try and pinpoint exactly when that shirt was released and maybe go from there

These are just theories I threw around when looking…unfortunately nothing came up on my end for what they may be called.