I saw the 4-foot model on exhibit a couple years ago. The model still had scars from where the extra pieces were. It's pretty obvious why it was never sold at auction. It's too trashed to sell.
Well, they knew they were never going to use it again - ST: Generations went back to the exclusive use of the [refurbished] six-footer, after all, and they destroyed the E-D there (and if they hadn't, they'd probably have continued with the six-footer for any further model work). Why would they spend the time refurbishing an obsolete model?