Kept the 13 and scrapped the rest?
That'd be the Most Likely answer, but you'd think 30+ perfectly useable 'agricultural tractors' would be useful to the nation's farmers - unless the entire experience was so embarrassing for all involved that everything was cannibalized/repurposed/melted down again.
But where's the fun in that? What if they packed this junk off to one of the Allies, and the combat history(ies) was equally embarrasing (and subsequently forgotten)?
I mean... that's kinda why we're here, ya?