Thanks for telling us about your data. Various people have collected such data over the years, but it's always good to have more. How hard would it be for you to further break it down by item type: swords, handguns, bombs, helmets, suits, shields? Do you have that information recorded?
At this wiki page...
https://wiki.spiralknights.com/User:Jdavis/UVs
...I use data and basic probability theory to estimate the cost of obtaining UVs from Punch. Depending on exactly what your 2,670,000 figure represents, it might be very close to my predictions (or not).