i want the top corners to look like bottom ones

file https://blend-exchange.com/b/30Jg0Aok
if the materials are lost you can easily replicate the material by maxing out specular and transmisson then turning down roughness to 0 if you want to check it out please do 🙁

Multiple different ways to achieve it, change the light setup or use the compositor.

edit, with compositor(after moving also camera and cube to be aligned):

https://filebin.net/0s59tg0jsdgghvs7

PS. blend-exchange is only for uploading and linking to stackexchange, by linking it here you are technically violating their terms and conditions.

    Megalomaniak i figured it has to do with lighting but i just cant get the lighting setup to look the way i want your file has bottom corners looking like top i was kinda looking for the opposite :p
    ps:oops