Did you lose the bolt handle when it came off your bolt? That wasn't clear in your post.
The reason I ask is because the SBE bolt handle was designed to be able to pull out for disassembly of the bolt carrier/ head assy. It's held in place with a spring detent in a groove on the root of the handle post. If you still have the bolt handle, just press it right back in until it snaps in place.
In the event you know all that and you lost the bolt handle, you can't typically buy them from sporting goods stores. You either need to buy directly from Benelli USA: http://www.benelliusa.com/shop/parts
Exactly! I can't imagine why Briley would tell you such nonsense. It literally just presses and snaps into place. It's intentionally designed that way so the user can easily take down the bolt carrier group without tools for easy cleaning.
Reach out to Rob Roberts in Arkansas... They do custom work for Benelli and have a upgraded one. I would imagine they may have some of the OEM ones left over. May be worth a call. They've been very helpful to me in the past.
"Good judgment comes from experience, and a lot of that comes from bad judgment..." - W. Rogers