I doubt you have a military grade 040.
A Military spec 68040 costs over 1000USD alone. If it is radiation herdened it can costs around 2000 USD.
It will have all gold plating, operate from -55 to +125C ambient, have a DESCC drawing number and a CoC. The chip package is not black but grey.
Does you chip have this?
Did Motorola or Atmel make the chip?
Why would anyone put a Mil spec CPU in a commercial computer?