Low humming noise

I switched from Sky to Virgin in August, using a 360 box. I have been hearing a low humming noise that I’ve finally figured out is the 360 box, looking on this forum it’s quite a common fault. I read something about the different makes of boxes but I don’t know how to find out the make? I paid £50 to Virgin for the box because the default for new customers is now a streaming box, which I don’t want. It looks like Virgin are giving out refurbished boxes according to other posts, any ideas how I can tell if it’s a refurb and if Virgin still give out brand new boxes? Thank you!