And it came to pass on the morrow, when the Philistines came to strip the slain, that they found Saul and his three sons fallen in mount Gilboa. On the morrow - It is very likely that the battle and pursuit continued till the night, so that there was no time till the next day to strip and plunder the slain.
Related Commentaries of 1 Samuel 31:8
1 Samuel 31:8
8 And it came to pass on the morrow, when the Philistines came to strip the slain, that they found Saul and his three sons fallen in mount Gilboa.