only if they are on a plank frame box.
drying oil will cause cracking in leather that flexes
I would agree with a leather cream. You need something rather more nourishing than linseed oil I would think.
I know linseed oil is good for sealing things, but I can't stand the smell so never use it. It is recommended for sealing wood, but I always use an alternative; not so good, but doesn't stink like linseed.