Oh yeah, I think you posted about this the other day right? I started to answer then I got distracted by my 5 year old.
Since they haven't been used, rinsing should work okay. I've found that it's really hard to get all the flavor out just by rinsing, but if you take the filler out, you can get most/all of it out.
I got sent some go-go cartos with a tobacco flavor by mistake. The vendor replaced them and said I could just keep the filled ones, wash and refill if I wanted. I rinsed those things repeatedly, boiled at least 6x, soaked in vodka, and dried them out really well and they STILL smell like the tobacco flavor. I haven't tried to use them yet, but I'm hoping whatever flavor I finally put in them goes well with and kind of masks the tobacco flavor (cause I don't like it).