HELP, advice on Grade A Mint galaxy s9 ultra (tiny tiny dent)

Hi guys

this is my first time ordering from CEX, and I need some advice.

I ordered Grade A Mint galaxy s9 ultra rather than B

It arrived today in a full box, looks like a new tbh

BUT!! I have noticed a tiny tiny cosmetic issue on the front as shown in the picture.

I am not sure whether this is acceptable extent for grade A? or am I too sensitive, shall I just move on rather than exchange?

please share your opinions

many thx!