But both asumtion has serious drawbacks. To repeat, if it was the case that the enemies of the Christ have stolen his body then they could easily show his dead body. If it was the case that apostles have stolen his body then it is very difficult to believe that they would die as martyrs for one deception they have made. Now someone could object and say that people are willingly ready to die for some idea, be it religious or some political. That is true.
People can die for various lies and deceptions.
If they stole his body then they have fabricated a lie about his resurrection, which they were perfectly aware of. Remeber that they were quite simple fishers and not some kind of mystics. They had quite a pragmatical mind. It is quite implausible to assume such possibility. Perhaps one person could do it, but to say that all twelve died for a lie they have fabricated is really difficult to accept.