Seems he'd like your address to warehouse product in quantity. You carrying bulk, reducing cost of his 'free' shipping offer. Since every item in his catalog is nearly identically priced, it would be substantial. What he offers are basic 'use everyday' type tooling. With new people joining all the time, the space consumed might be considerable.
Could be legitimate, or another version of the Nairobi check kiting schemes. Fact he's established on Ebay shows initiative, not honesty.

For me, his feedback is too low [and not 100%] to consider partnering without certain protections for you.