What was BTC #3 wallet only a week ago now has 0 (ZERO) coins left. They appear to have been sent to Coinbase. And we now know that Tesla sold 75% of its Bitcoin holdings. These are interesting time
What is the situation with Wallet #3?
We really don't know what Wallet #3 you are talking about and what it's relation to Tesla. We even didn't know who the owners of the majority of the wallets as it didn't have a name on it.
In any case this is just pure speculation, whether it was send to Coinbase or whatever. Maybe the wallet you are referring to belong to an exchange or even gambling site that's why they have huge amount of bitcoin to begin with.