60 days? Where are you? In the US it’s 180 days. In Canada 90.
Fabric rustling etc is the fact that now you’re hearing it. Eventually it should just become background and you won’t focus on it so much. Add your audiogram. Maybe you have standard, older aged, higher frequency hearing loss and you haven’t been hearing those kinds of sounds for some time.
I don’t think ANY Costco HA provides tinnitus anything. I suspect they get that de-featured to keep costs down.