Here are the questions I would ask myself....How much space do I have? Do I want to expand from that space? If so, How much???
I agree you should take anything he gives you and sort our what you want. Then immediately pack up the rest and send it out. If things keep coming and you find something you can't live without pick out something from your stash and out it goes. Sounds like a lot of work, but it will keep you manageable.