The farmer tendency is to never get rid of anything that can be used again.  Before doing anything talk with a bin salesman and see what 1, 2, or 3 bins with the total capacity you need will cost.  Then get a total cost of moving the old bins.  I suspect once you get actual numbers going with new might be cheaper.

A few years ago I bought 3 bins a neighbor was removing.  Had 2 - 27 foot bins taken down and put back up in a new site.  Got all done and found I could have put up one new bin with more capacity for the same or less.