I haven't looked at Freenet in years, but won't objects for keys that you've requested (/uploaded?) exist in your local cache (until they get pushed out by other traffic on the network)?
Instead your node is no more statistically likely to have any portion of the objects you've uploaded than any other objects throughout Freenet. When an upload is complete your node doesn't have a full copy, all the chunks are spread out amongst the nodes within a few hops of you instead.