Title transferred on 10/23... friends of previous ownered entered premises afterwards without permission. Friends argument is that transfer of title does not give ownership of remaining items in premises until date of possession/occupancy. My reak estate agent saying everything mine after title transfer and keys rendered.

Your real estate agent is right. Once title is transferred you are the owners of the property and its contents. UNLESS there is an agreement for the previous owners to retain possession for a set time. This is what happened when I bought my first house. The sellers needed more time for their new house to be ready. But if I delayed the closing I would have lost a very favorable interest rate. So we entered into an agreement to allow the sellers to pay rent until their new house was ready.

But that doesn't sound like the situation you are dealing with.Did they take anything out of the house? What was their purpose in entering? How did you learn about it? And what do you want to do about it.