How we feel and how we act are often very different.
Well I think in that if he is guilty he must be extremely stupid
not to check the house when he had the chance
Tell Julie
Break into the house after the murders
Not think about his behaviour after the murders and how it may be perceived.
Go along with Basil Cock and start thinking about the money and clearing the house.
Of course it could be that if innocent he was just a greedy person and thought financially Sheila had done him a favour .