A couple of suggestions...

1) Run the CVV Code (the 3 digit code on the back
of the card) to make sure that he is in position of
the card and not just the number.

2) Run the billing address on the card and demand
that the item be shipped to the billing address ONLY.

Honestly, it doesn't matter that you've been working
with him for a couple of weeks. Take every
precaution anyway.

As the saying goes... better safe than sorry!!