There were of course earlier Franklin expeditions in 1819-22 and 1825-27, tho I don't recall mention of food caches from either. Could also be a somewhat garbled retelling of the stores of the HMS Fury wrecked in 1825 were cached on land & came to the rescue of John Ross'
expedition in 1829.I think several later expeditions found the were Fury's stores still edible as well.