There have been cases recorded in the past where bodies have been unrearthed in fresh condition, during the time of 'Umar ibn al Khattaab, a body was unearthed accidentally and some thought it was Prophet Daniel :saws: ,
Also during the iran iraq war, there were obviously martyrs from both factions since some were fighting only for the sake of Allah, a body from the Iranian faction is reported to have later been found in pristine condition, vids also available on youtube.
Many others have been reported during the russian afghan war and a reporter who witnessed such phenomenon came to accept Islam himself and was later martyred, here's the iranian one:
Also of note is the body of Bernadette Soubirous - indicating that truth, sincerity, intention, acceptance of what is available to a person of the truth, righteous action, and fear of Allah play a huge part in salvation, curious story considering her last words, but that's the best of her knowledge according to what she was taught, and Allah knows best.
(Khidr and the wall, Quran 18:82 comes to mind).
Here's an afghan one:
Btw, we are not Muhammad's (may the peace and blessings of Allah be upon him) servants, we are servants of the Creator of the heavens and the earth, besides Whom there is no other god, and who has taken neither a wife, nor a son.