Does Christ's resurrected body go back in the tomb?
No. Christ's resurrected body is a spiritual body and is not placed back in the tomb. What is buried is the old physical body of corruption, prone to disease and failure. Flesh and blood cannot inherit God's kingdom, and corruption does not inherit incorruption. Resurrection produces a new body fashioned after Christ's body.
Les explains that flesh and blood cannot inherit the Kingdom of God, neither does corruption inherit incorruption. He emphasizes that a spiritual body such as Christ's resurrected body is not put back in the tomb. The body that goes into the grave is the old physical body, already corrupt, prone to disease and failures. But when it comes out in resurrection power, it will be a new body, fashioned after Christ's body. Les also turns to Ephesians 1:18, Paul's prayer on behalf of believers, expressing that if this is not experienced in this life, it will be in the next.
Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.