Question About A Second Refund

Hey guys, let me summarize it so you know the full details
4 days ago ish i made an account on amazon(first time) got my prime trial, ordered a monitor and ssd(300$ total)
got my refund the day i got my items(2 days later)
now my question is how long if at all should i wait till i do another refund? and will it be okay under 500$?
Edit*
i bought random small items inbetween to make it look legit

I'd wait till my "small random items" come then i would order, get item, wait at least a day,refund.
Under $500 is fine.
My second refund was $400 and i waited a day on it.
Still no CIS Warning