Do you have a cat? Those might be gnaw marks. Otherwise, some of of drilling insect? Phantom poker?

I was to say that it looks like some physical damage too.
Could have been 'squished' against something, another plant?

Not much help but it looks like asteroids stuck the moon.

the media looks like straight peat ...

did you repot your new rescue???

why do you say.. it was not healthy ... but now ask.. why its not healthy ...

all i am wondering.. is if i am missing something?????

ken

I don't have a cat but it could be trauma considering how it was treated badly in the store. I'm actually starting to think that because the leaves were drooping they overlapped for some time and the sharp end of the top leaf started to slowly make indents... but what are phantom pokers???

Also yeah they do kinda look like moon craters haha!!!

And I did repot it temporarily in potting mix and pumice because it was originally not healthy due to being over soaked (the soil was like mud)!

That orangy-brown bump on the lower leaf sort of looks like scale. That may have caused your craters. Can you scrape it off easily with your fingernail?