Indent/evap or faint line?

M

So I took the first test yesterday and i looked today and now the line is white so I'm pretty sure it's an indent, the second test I took around 3am and the third test I took at 8 am and I see the faintest line in person but the camera doesn't pick it up. I'm thinking they're all evaps or indents but I thought I'd get more opinions.