A question about the T34 model 1940

There are dozens of books, but try this:
T-34/76 Medium Tank 1941–45
New Vanguard 9
Author: Steven J. Zaloga
Illustrator: Peter Sarson
http://books.google.com/books?id=a-QlhQlYZXQC&printsec=frontcover&source=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

you can't prove a negative but given the enormous losses the first years of the war, it's hard to imagine a unit that could have kept one of these intact and running after 2+ years of war.  Plus, the M1940 was the fewest numerically.  I'd be shocked if even one were running by mid 1942...