Keep old keys for the mine
Dinkum items can have uses that are not obvious from their appearance. KRAFTON's FAQ says old keys are needed for the mine and connects them to obtaining a Deep Mining Licence and constructing the entrance. Selling or discarding them simply because they look old can leave you without an item you meant to use later.
That answer does not list every lock or a precise number of keys required on each trip. Separate a confirmed item function from a community-generated loot prediction. Check the actual mine and your current inventory before deciding how many to keep.
Process shiny stones
The publisher's shiny-stone FAQ says a Shiny Stone can be processed using a Stone Grinder. It says the grinder can be bought from John's Goods after the shop has been built. This gives you a concrete next step for an item you might otherwise sell without checking.
This is not the same as a Shiny Disc, which appears in Franklyn's invention unlock conditions. Similar-looking names are not evidence that the two objects can be substituted. Exact grinder yields and current stone resale prices are 待确认.
Sell carried finds
KRAFTON's carried-items FAQ describes a fossil or unusual rock lump that you physically carry. Bring it to John's store and place it on the scales to sell it. The answer mentions a wall poster depicting someone carrying a block to help identify the selling area.
That route is distinct from processing a Shiny Stone or keeping an old key for the mine. The later Great Bite patch adds a Giant Shell that can also be placed on John's scales. No universal selling price for each carried item is established by these descriptions.
New books and travel items
The Great Bite update lists a Critter Book for aquatic creatures and an Encyclopedia combining the Fish, Bug and Critter Books. It also lists a Servo for calling a vehicle and a Single Person Tent available through John's shop rotation. These are a few official examples of newer items with distinct purposes.
An exhaustive inventory, every acquisition rate and every item's price remain 待确认. For practical sorting, keep items with an imminent documented use, process what a station explicitly accepts and sell carried finds using the stated shop interface. That is a cautious decision rule, not an in-game command to sell everything else.
QUESTIONS
What players ask
Where do carried fossils go?
KRAFTON says to put a fossil or large rock lump on the scales at John's Goods to sell it.