We have released the first part of the museum update this week, but the next part unfortunately will take some time because we have a lot of piled up work from the other job to deal with, so progress on the following 2 or 3 weeks will be very slow.
The next feature will be digging and artifacts, we will introduce the shovel, you will be able to use it similar to the bug net, but for hidden treasure instead of critters, just keep in mind digging won't modify the terrain, due to technical limitations.

Every few days a hidden treasure will appear in the world, and the shovel right click will let you search for it, similar to how the bug net highlights critters, once you get to the right spot you can dig, there will be many different possible items: loose coins, truffles, subterranean critters like worms and unique treasures that you will be able to display in the museum for more discounts in the debt.
After 1 ingame year the unique treasures will start to spawn again and you will be able to get a second copy to decorate your home with.