I posted a few threads in the discussions forum but thought Id summarize here in case these things aren't working as intended.
For the butterfly and mole collections I am always waiting on one item for each collection. For the mole collection it is the sunglasses. For the butterfly collection it is the green butterfly. Both seem to have a very low drop rate. I have bunches of all the rest and since its just the one item for each that lags behind, it feels like this is intentional to have one item be much harder to get. I'm bringing it up just in case. It won't be long before I have over 10 of every other collection item but these two.
Paint seems to be very rare as well... Much rarer than the other upgrade items. I get it once in a blue moon from orders and butterflies. Don't think I've got it from moles before.
The mine seems to have become more difficult with the location leaning more to edges and corners where people are more apt to waste turns finding the initial area. I used to always get 2 items and most of the time 3. The ore/item drop rates in the mine seem to need much better balancing as well. It leans far too much toward silver.
The paint and mine rates cause a lot of wasted barn space waiting for them in order to either jewel craft or upgrade buildings.
This could all be intentional/working as intended but I thought I'd bring them up in this forum in case. In my opinion, all these things need code change to balance/smooth out the drop rates.