rims just came in....got some ?s

[97CivicBoy]

Hey, I dont knwo if you guys knew...but my bro ended buying those SI rims w/tires for 500 shipped from Ebay..just got them today. I got a few questions though. Everything on teh rims were nice...no scartches...tires had good tread...but on one of the tires there seemed to be like two pieces of rock lodged into it...It seems to be holding air ok...I dont want to take them out and then get a flat...what do you think i should do on that...and one more question is that I used to have aftermarkte 17" rims that I had to get special lug nuts with a special key and I was wondering if these lugs would fit on these SI rims for security purposes. thanks