Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: "If someone takes something from the spoils of war and the army disperses, then he should return it to the Muslims' spoils of war."
Hadith Referenceسنن سعید بن منصور / كتاب الجهاد / 3910
Hadith Gradingمحدثین:إسناده حسن لغيره
Hadith Takhrij«إسناده حسن لغيره، «انفرد به المصنف من هذا الطريق»» قال ابن حجر: عبد الرحمن بن زياد بن أنعم ضعيف في حفظه، وكان رجلا صالحا
Brief Explanation
Since its content is supported by other authentic (sahih) and good (hasan) narrations, therefore it is at the level of "hasan li ghayrihi" (good due to corroboration).