The first prototype - you mean that ugly demonstrator? As far as I know, it was destroyed or highly damaged in Rechlin during Allies bomb attack.
Now about "140" - there were two prototypes of this aircraft:
The first was, as I mentioned before, rebuilt from the second EF-131 prototype. It made its first 20-minute flight on September 30, 1948 in Teplyi Stan. Engine problems were detected already during 2nd flight on October 5, and after 7th flight the tests were stopped. They restarted next year after replacement of engines, and on May 24, 1949 the factory tests finished. Maximum reached speed was 904 km/h, flight range 2000 km. But the aircraft wasn't sent to the state tests, but converted into recon "140-R" instead. The unsuccessful Mikulin AM-TKRD-01 engines were replaced by Klimov VK-1 (updated RR Nene), not so powerful but much more reliable and low-consumption. Wing span was increased from 19.4 to 21.9 m, additional fuel tanks were mounted on the wing tips (overall fuel capacity increased from 5820 to 10 600 kg, calculated flight range to 3600 km). 20-mm cannons in the turrets were replaced by 23-mm, and former bomb bay was occupied by cameras and other recon equipment. The "140-R" was first flown on October 12, 1949 from new-built Borki airfield near the factory (the militaries opposed to presence of the Germans in Teplyi Stan); the pilot this time was Russian - Ivan Fedorov. But the flight was aborted due to extreme wing vibrations, as well as the next one on October 20. The aircraft returned to the factory for retrofit works; the tests restarted in Spring 1950 but stopped after 2nd flight - the vibrations continued. After this, TsAGI specialists were employed to solve the problem. They assumed that wingtip-mounted fuel tanks cause the flutter; but on July 18, 1950 the whole "140" program was cancelled (the extremely successful Ilyushin Il-28 already came into production) and "140-R" newer flew again.
The second aircraft was built as "140-B/R" which could be a bomber as well as a recon aircraft. Its main difference from the "140-R" was in equipment; the crew reduced from 4 to 3 men due to improved gun direction system. Calculated flight range was 3000 km with 9400 kg fuel capacity and 1500 kg bomb load; maximum speed would be 866 km/h. The aircraft was completed and passed the ground tests but was never flown due to program cancellation. It seems that both prototypes were then scrapped (anyway, they didn't came to Monino Air Museum).
(Source: Sobolev D.A. The German trails in Soviet aviation history. - Moscow, 1996)