How are USPS small flat rate boxes received?

well i am thinking of ordering a yo yo and some accessories from yoyonation.com or yoyoexpert.com and i am assuming it will be arriving in a USPS small flat rate box since it is just a yoyofactory yoyo, 10 yoyo strings (or 25 strings if i decide to order from yoyoexpert) and yoyojam thin lube. how are USPS small flat rate boxes received? will the box be in my mail box or will a mailman ring my doorbell? i am asking this question because this will be my first time ordering something online from USA. I will be going on a trip soon and i would like to receive my order after i come back. If a mailman delivers my order then i will have to order my yoyo after i come back since the postal office will send back my package if i don't collect it within 2 days. If it will be in my mailbox, then i can order it now, i would be able to get my package when i come back.