damn rod cap (update cap found)

:Dwell out of town working and have my stuff sitting on the table in my shop.. my son and his friends use the shop to do god knows what and have moved my stuff around and now I cant find my rod bearing cap... just a stock cap but I don't think I can just get a cap and replace the 1 that is gone with out any problems ..he is looking for the lost cap and hope that he finds it.. but what should,could I do this is a cheap low buck build???????can I just replace it with another cap and be done ???? or would I have to have some work done??? I hope he finds it as from now on the shop will be locked and no 1 will use it unless I am home.. going to give him his own tool box so when they lose or break something its his mess..:banghead::banghead::banghead::banghead::banghead: