I can’t comment on the USA’s procedures, but where I live, a long time in customs = you are about to get raided by the authorities. I would move or get rid of anything in your house that you shouldn’t legally have, esp’ needles, partly used vials or vials for your next cycle. Also make sure you have to sign on to this site manually rather than automatically each session. Your computer could be seized and scrutinised and used as evidence against you.
Your order is pretty small, so you might only get a letter. The legislation in most western countries is pretty over the top, so there is potential to get into a lot of trouble if they want to put you through the wringer.