The papers he received are the Confirmation of Permanent Residence (COPR). He is NOT to sign or change these papers in any way until he arrives to land. The immigration officer who lands him will direct him where to sign.
The B4 form is for goods he is bringing to land with him, he must list any personal possessions that would normally be taxable on importation, such as jewellery, electronics and so on. The jewellery should be appraised/valued, and electronics should be listed by serial number. If he is shipping anything after him, he uses the B4A, which is for Goods to Follow. Same thing, he lists valuables separately, and groups any ordinary items like clothing, books, etc. You can find the B4 here:
http://www.cbsa.gc.ca/publications/forms-formulaires/b4-eng.pdf
He only receives a waiver on the taxes on importation of his personal effects, the weight of his bagagge is for the airlines to charge.
