This would usually be with the intention of later recovery by the hoarder; hoarders sometimes died before retrieving the hoard, and these surviving hoards may be uncovered by metal-detectorists, members of the public and archaeologists much later.
This would usually be with the intention of later recovery by the hoarder; forgetfulness, or the death of the hoarder, meant that some hoards were never recovered. They survive, uncovered by metal-detectorists, members of the public and archaeologists much later.