Safety Detent ball rolled into 590

Purchased the Defender Tactical Safety Sight for my brand new Mossberg 590 (50778). During install, and because I have terrible fine motor skills, the safety detent ball rolled forward and into the small hole in the safety groove. No amount of shaking could get it back out. Thankfully they included an extra ball so I could complete the install. But I'm worried about the ball inside my new gun. I don't hear it rattling around or making noise. Should I just let it be or do I need to disassemble this whole thing to find it, something I've never done before as this is my first shotgun.

Bonus question: the safety is quite stiff, but I can't remember what it felt like before. Is this common and I just need to break it in or could it related to the missing ball?