Well, at least they don't have to look very hard for whoever's responsible.
I was trying to get a time period for the body so I tried looking up when the storage unit place was founded but that information is hard to find out and I came up empty-handed. But I may have come across a clue. When I was taking a look at the place from google street view I found out that Stock n Lock where the body was found was used to be called Stowaway. Sometime between July 2017 and August 2018 they went from Stowaway and became Stock N' Lock. I'm not sure if they just changed their name or if they were bought by Stock N' Lock (Stock N' Lock is a chain of storage unit facilities in Utah) or even if this could give a possible idea of how long the body was there for. I don't know much about storage unit business and I'm not sure what happens to storage units after the facility is sold to another company. If the name change doesn't mean anything and It's possible whoever owned the storage unit owned it when the place was still called Stowaway, then according to Google Street View the body could've been there before 2008.
It would really help if we knew how long the storage unit had been there for.