We are sorry that happened, @Jayceeay! Let’s take a closer look. Must of our devices are shipped with the SIM card pre-inserted. We'd like to know, have you tried to open the SIM tray to look for the card?
Thank you for the information. It looks like you need to order a new SIM card. Please keep in mind that using the regular shipping method can take 3-5 business days. If you don't want to wait, you can buy the SIM card at a Boost Mobile store.
Please send us a DM so we can chat further.