The B-32 was a very short lived aircraft, only used from May of 1945 to Aug of 1945.
Only 118 were ever produced and in fact the ones that were on the assy line in Aug 1945 were scrapped.
None are known to exist in museums or private collections.
The B-29 was the aircraft that was similar but had a better track record and was produced at a level of about 3970 units.