Cannot pickup/complete 'hunter caches' because my 'pack' is already full of the 'resource' that the 'hunter cache' provides
e.g.: I have 10/10 'rare south rock' and the 'hunters cache' awards 'rare south rock'.
This leads to the situation where I walk up to the 'hunters cache' and get the information that my 'pack' is already full of this 'resource'.
This means that I can not pick up the 'resource' to complete the 'hunters cache'

Is there a way to drop 'resources' from the 'pack' or move them to the 'rewards stash'? If not is there a way to edit the save file to reduce the number of 'resources' below the maximum number so that I can pick up the 'hunters cache' with 'E'?