Hasn't happened yet. This is an "off" year here too... A bit concerning actually. Seems to be an off year everywhere. We will be advocating planting and restoration rather than harvesting this year.
I know that some of the Native American acorn-based cultures here on the west coast had Granaries and caches. Sometimes the cache also served as a leeching pit. Here in the Portland area, Chinookan peoples would bury the whole acorn in cedar bark baskets in the bank of the river for like 6 months then come back. I think this probably extended to off years as well. I know in California they had more standard, giant "granary" baskets for off years.
There is a lot of this information in Nancy Turner's books, as well as M. Kat Andersons books.