@Zweiblumen Doc now has full control of the F-B Bumblebee.
@All Sam has a Transys Avalon, so that's the highest rated commlink. Sam's skin isn't going to melt a credstick (or a commlink) immediately, but it probably will make it unusable after a while. That probably only matters if you care about the ¥1,000 value of the credstick itself.
After that, Kat has the next best commlink at rating 5.
A commlink on its own can hold ¥0. A commlink linked to a SIN and a lifestyle can hold ¥∞ via a bank account. Without a SIN or a bank account, neither of which Doc has, you'll have to load it onto credsticks.
As I said, I'm not trying to play gotcha with this detail; I just want to RP it correctly. Doc certainly has enough Logic to foresee the issue and come prepared. Given the economic depression of Grand Junction, you can't find any Platinum credsticks on short notice. You can find Gold credsticks, which means you'll need 20 total. You have ¥2,800 remaining so you can afford this.
I'm going to say it takes a combat turn for Doc to physically grab a credstick, tap it to his deck to transfer funds, then drop it. That means it will take 30 seconds to do the first million and a minute to do both millions. Ohanzee just needs to give a speech long enough to fill that time.
Diamondback can verify the foci and the magical lodge materials. Diamondback doesn't have a clue about the lab; nor, for that matter, does Ohanzee. Someone could open it up and let Doc peek at it via a drone or glasses, I suppose.