I agree with one of the earlier postings...this doesn't mean humans were domesticating plants earlier. Someone discovers some grasses have edible
seeds, they gather them, eat them.
...but a storage place for seeds/grain prior to agriculture..? not that hard to believe...in fact probably more of a logical evolution from gathering
to farming don't you think?
They probably learned the hard way from poor "gatherings", going a bit hungry over winter or eating mainly animals (maybe a cause for the extinction
of mammoths? Just a thought :-) ) so logically the next step would be to gather more for the next winter? If squirrels can do it then so can humans.
So I reckon they stored the stuff in their own home until the rats/mice/vermin plagued dwellings, til some screaming "cavewoman" , lets call her
Wilma, moans at Fred to build another place to keep the rats away from Pebbles...so Fred builds another one out the back but still got rats and stuff
so built a raised platform for the following year...much the same way we still do things. Trial, error, mistakes made, learned from those
mistakes...in fact don't we still use this method...
...yeah you're right...ancient people were smarter than us...well, some of us anyway 
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