I see in the Browser Schema of an Item Fulfillment a "Picked Date" "Packed Date" and "Shipped Date". I also see these in Saved Search. I have also seen screenshots of these fields natively displayed on an IF record. However... I cannot find these fields in the forms. What gives?

I believe these fields are available only if you enable the accounting preference to track these dates separately.

Do you know what that preference is called? Cannot seem to find anything similiar.

Yes, that's it.

I would have thought it's

Pick, Pack and Ship

feature that needs enabling