It’s not unusual at all to have a low single digit number of cycles on a brand new factory sealed MacBook battery...I've never seen a apple laptop with 4 cycles on it being new unless it was a refurb. They always have ZERO cycles. Most likely this was a return to Best Buy and they rewrapped it. Not good.
OP in your case it’s probably best to use it a while and see if all is well or you notice anything unusual (unexpected shut offs; noticeably short battery life etc) - the batteries are warrantied and it’s possible Apple may replace it for you (though their criteria is 80% at 1000 cycles I believe so don’t take that as a guarantee)