Richard Tosaw
Galen has told me on several occasions that Richard Tosaw had told him directly, or inferred, that he had gotten additional Cooper information from his brother Mike, who was a special agent in the Seattle office during the Norjak period. Mike was not on the Norjak case, nor was he beloved by his fellow agents in the Bureau, but Mike may have been the source of the "packing card" info and other tidbits.
Remember, Galen and Richard Tosaw worked together on the Columbia River dredging project over several years. So they certainly had the buddy-buddy type of relationship where these kinds of off-hand pieces of information might have been exchanged.
Richard Tosaw was a kindly old gent, and I truly wish I had been able to meet him before his death in 2009. He and I only met over the phone. and only spoke briefly.