@MacTopus29 can you please make your thread titles more meaningful - just putting "question" or "just curious" is pretty vague!
Externally, no. Software should tell you pretty quickly. Internally you should be able to to tell pretty quickly if a board swap, RAM upgrade (google the RAM part number), and there were many DIY methods carried out too (piggy backed chips, new sockets for RAM swap, or aftermarket board upgrade).