Kim was recently complaining that US technical people were blocking the destruction of nuclear capability.
Sounds like he was telling Don that there was fuckery afoot. Don's tweets sound like he has looked into it and agrees.
Box of pens? He uses cigar pens (name for the bulky body size).
That doesn't look like the Resolute desk. I think the Resolute desk is a pedestal style desk with a rectangular top about 6-7 feet wide by about 3' front to back. (it has / had a secret panel installed for John-John to play with. ) This desk seems to have burl set into the top and the Resolute desk was made from the salvaged remains of a Revolutionary war sailing ship … an unlikely source of such a large piece of burl.