Fascinating, Jim. Though it could be speculated (and that's all it is) that in order to test a small run of a new set of dies for bronze, only one small corner of the Mint premises would have been needed, especially if all that was produced was a handful of coins. The only comparison would be the time that the Mint was entirely rebuilt for the Great Recoinage of 1816, but then of course, there was no need to 'Suspend' operations, as Boulton's Soho mint was handling the copper, and an ungodly mix of silver coins was in circulation, ranging from the great production runs of 1758 and 1787, the counter-marked dollars and Spanish reales, the Bank of England token issues, etc etc. The next great imterruption was the move to Llantrisant and even as recently as that, we are not sure exactly what the London Mint retained, and what Llantrisant took over, between 1967 and 1971. So clarifying the position in 1882 - no chance!