Blai continues to not get a Sending or a scry or a visit from a teleporter.
One day when he heads into the galley, the windows aren't covered anymore.
Nope. Many of the people aside from the ambassador look pretty nervous but that has lots of plausible explanations.
Francis consults a device. "There's a suitable lab. If you would like to personally heat these as opposed to observing the process we would prefer you wear some safety equipment."
In that case, they can head to a lab and Blai can watch things melt and smoke.
(The smoke does not go into the room, it goes somewhere else.)
As long as every single item presented to him in the group represented as complete is an unrecognizable melted mess he will call it good.
Luckily, they actually did happen to bring back the relevant electronic waste by airplane instead of by truck, so yes, it's everything.
It looks like a cross between an IKEA assembly instruction set squeezed into a single page, and the Codex Seraphianus.
"I wish to remind everyone that I am not a wizard," says Blai. "I did not personally scribe this page; it was taken from a wizarding student who did not manage to achieve the performance in school required to pay back their student loans and had their spellbook confiscated instead to cover some of those costs, so we must assume that they were not, really, a wizard either, and their scribing may leave something to be desired for this reason. I expect you to have a lot of questions I will not be able to answer. What I can do with this page is explain the steps I go through to prepare the spell on it, and I can demonstrate that live if it is necessary by first dropping the copy I have hung, though I need to concentrate quite hard for an hour to do it."
Blai really expects them to be disappointed, but sure. He touches the drawing like so to draw the magic out of the spellsilver in the ink, while he mentally rehearses the IKEA assembly instructions, very slowly because he is not very Cunning and it's extremely delicate, and eventually he has it from the shape it comes off the page in squidged into the shape that can hang on his scaffold, such as it is.
"It is any of several metals - I believe the commonest needs to be used in relatively larger quantities than the rarer kinds - which can hold and recharge magic. I do not have a way to determine what you call it in English so I've translated it. It's silvery. It oxidizes, when it's not in a magical preparation that preserves it like this ink."
"If we got you a selection of silvery metals that oxidize would you be able to tell which ones are and aren't spellsilver?"
"No. I've never shopped for the stuff and do not know how to make any kind of magic item myself."
"Do you know if it explodes on contact with water, or makes people who interact with large quantities sick?"
"Spellsilver mines are only about as deadly as any other kind of mine, I think. I have not heard them to be specifically prone to explosion. But I've never had contact with the industry."
"We don't suppose you know whether the ink preparation process has important steps beyond keeping the metal stable and able to be placed in the right shapes?"