As for the amount of reward mentioned in the report, it makes no difference here whether or not it is established. Concerning such cases, al-Tirmidhī narrated the following hadith:

“Whoever hears something attributed to Allah that promises a reward and acts upon it in hope of that reward, Allah will grant him that reward, even if the matter is not as reported.”

In summary, reports of this kind may be narrated and acted upon to encourage good and deter evil, but not to establish that an act is recommended. Moreover, believing what they entail—namely, the specific measures of reward and punishment—requires scriptural evidence.